Best Roof Cargo Boxes for Car: 15 Spec-Based Picks
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Choosing the best roof cargo boxes for car use comes down to shell type, weight, and volume. This guide compares 15 carriers using only the specifications published on their listings. The MeeFar 21 cu ft Waterproof Roof Bag leads the list by offering 21 cubic feet of storage at 10.7 pounds for roof mounting.
These measurements help you decide between a rigid hard-shell carrier and a high-volume soft bag based on your vehicle setup and gear capacity.
Quick picks
The best fit for you
- You need high-volume storage without a roof rack MeeFar 21 cu ft Waterproof Roof Bag It provides 21 cubic feet of overhead space and installs directly on bare car roofs.
- You need the largest available cargo capacity Mockins XXL 50 Cu Ft Roof Bag It offers 50 cubic feet of volume, the highest capacity on the list.
- You prefer rigid dual-side access with lockable security Relaxcabine 14 Cu Ft Hard Shell Roof Box This hard-shell model features dual-side opening and a 150-pound load rating.
- You want a compact lockable hard box for crossbars DNA Motoring 11 cu ft Roof Box Its hard shell holds 11 cubic feet with a 110-pound load limit.
Our 15 picks
MeeFar 21 cu ft Waterproof Roof Bag
Best for: bare-roof cars needing flexible luggage storage
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 21 cu ft
- Shell Type
- 800D PVC tarpaulin
- Water Resistance
- 100% waterproof
- Security
- combination lock
- Vehicle Compatibility
- with or without roof rack
This soft rooftop cargo carrier gives you 21 cubic feet of overhead storage without requiring a dedicated roof rack. Built from 800D PVC tarpaulin, it secures directly to crossbars or car door frames using included hooks. It suits drivers who need space for up to six suitcases on standard cars but want compact storage between trips.
Pros
- Mounts with or without a roof rack using included door hooks
- 21 cubic feet of capacity accommodates 4 to 6 suitcases
- 800D PVC tarpaulin shell with high-frequency voltage seams
- Includes a combination lock and waterproof zipper flap
Cons
- Soft tarpaulin fabric offers less impact resistance than a rigid hard-shell box
- 21 cubic feet capacity is smaller than oversized 40- to 50-cubic-foot rooftop bags
Good fit if
- You drive a bare-roof car without pre-installed crossbars or rails.
- You need to transport up to six suitcases or bulky camping gear.
- You want a lightweight carrier that folds away when not in use.
Skip if
- You require the solid structure and aerodynamic rigidity of a hard box.
- You need massive cargo capacity exceeding 30 to 50 cubic feet.
Verdict: MeeFar 21 Cu Ft Waterproof Roof Bag delivers high-volume, weather-resistant storage for road trippers driving cars without roof racks.
Sailnovo 21 cu ft Soft Roof Bag
Best for: lightweight, waterproof cargo storage for cars
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 21 cubic feet
- Shell Type
- Soft Shell
- Water Resistance
- Waterproof
- Installation
- Tie-Down Strap
- Dimensions
- 9.84 x 7.09 x 13.8 in
The Sailnovo 21 cu ft Soft Shell Roof Bag is a waterproof cargo carrier designed for cars. It offers 21 cubic feet of capacity and installs with tie-down straps. This soft-shell bag is a lightweight and flexible option for adding storage when you need it, suitable for occasional use.
Pros
- 21 cubic feet of cargo capacity
- Waterproof construction
- Lightweight at 8.16 pounds
- Available in 15 and 21 cubic foot sizes
Cons
- Soft shell offers less security than a hard shell
- No locking mechanism listed
- Requires tie-down strap installation, no integrated mounting system
Good fit if
- You need a low-cost, lightweight way to add cargo space for occasional trips
- You have a car without a factory roof rack and can use tie-down straps
- You prefer a collapsible bag that stores flat when not in use
Skip if
- You want a hard shell for better security and aerodynamics
- You need a carrier with a locking system
- You plan to carry heavy or fragile items that need rigid protection
Verdict: Sailnovo 21 cu ft Soft Shell Roof Bag is a practical soft-shell option for car owners who need extra cargo space on a budget and don't require the security of a hard shell.
RoofPax 19 cu ft Polyester Roof Bag
Best for: car owners wanting a waterproof soft bag with or without roof racks
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 19 Cubic feet
- Shell Type
- polyester
- Water Resistance
- 100% waterproof
- Installation
- door hook straps, 10 straps
- Vehicle Compatibility
- fits cars with or without roof rack
The RoofPax 19 cu ft rooftop cargo bag is a soft-shell carrier made from 100% waterproof polyester. It measures 47.2 x 35.4 x 19.8 inches and weighs 12.4 pounds. It installs with door hook straps and 10 included straps, fitting cars with or without a roof rack. This bag suits drivers who want a waterproof, durable soft carrier with a lifetime zipper warranty.
Pros
- 100% waterproof polyester construction with double-seam technology and water-repellent coating
- Patented 4-door hook straps included for secure attachment without a roof rack
- Lifetime warranty on zippers and 5-year warranty on fabric
- Available in 5 size options from 15 to 28 cubic feet
Cons
- Soft-shell design offers less security and aerodynamics than a hard-shell box
- No lock or anti-theft feature listed; zippers are not lockable
- Requires routing multiple straps through doors, which may be less convenient than a hard-shell mount
Good fit if
- You want a waterproof soft cargo bag that works on cars with or without roof racks
- You prefer a polyester shell over PVC for durability and weather resistance
- You value a long warranty covering zippers and fabric
Skip if
- You need a hard-shell roof box for better security and aerodynamic performance
- You want a cargo carrier that installs without routing straps through car doors
- You require a lockable storage solution
Verdict: RoofPax 19 cu ft Waterproof Polyester Bag is a well-built soft cargo carrier with strong waterproofing and versatile installation, backed by an extended warranty. It is a practical choice for car owners who need a secure, weatherproof bag without a roof rack.
Asinking 20 cu ft Waterproof Roof Bag
Best for: budget-conscious drivers needing a waterproof soft-shell roof bag
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 20 cu ft
- Shell Type
- 900D PVC tarpaulin
- Water Resistance
- 100% waterproof
- Security
- Lock
- Installation
- Metal ring strap design
The Asinking 20 cu ft roof bag is a budget-friendly soft-shell cargo carrier made from 900D PVC tarpaulin with triple-reinforced seams. It is 100% waterproof and fits any car with or without a roof rack. The bag measures 52 x 40 x 12-18.5 inches and uses a metal ring strap design for easy installation. It is lockable and folds flat for storage.
Pros
- 100% waterproof 900D PVC tarpaulin with triple-reinforced seams
- Lockable zipper with double-flap protection
- Fits any car with or without a roof rack
- Metal ring strap design for tool-free installation
- 20 cu ft capacity in a 52 x 40 x 12-18.5 in footprint
Cons
- Soft-shell design offers less impact protection than a hard-shell box
- No integrated lighting or remote lock listed
- Height varies from 12 to 18.5 inches, which may affect fit on low-clearance vehicles
Good fit if
- You want a budget-friendly waterproof roof bag for occasional road trips
- You drive a car without a factory roof rack and need a universal strap-on solution
- You need a foldable carrier that stores flat when not in use
Skip if
- You prefer the rigid security and aerodynamics of a hard-shell cargo box
- You need a carrier with a fixed height for consistent clearance
- You require a roof bag with a larger capacity than 20 cu ft
Verdict: Asinking 20 cu ft Waterproof Roof Bag delivers reliable waterproofing and universal fit at a budget price, making it a practical soft-shell choice for car owners who need occasional extra cargo space.
Mockins 40 cu ft XXL Roof Bag
Best for: maximizing soft-shell cargo space with a complete kit
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 40 cu ft
- Shell Type
- 840D vinyl
- Water Resistance
- waterproof
- Dimensions
- 72 x 48 x 20 in
- Weight
- 16.5 pounds
The Mockins 40 cu ft XXL Soft-Shell Roof Bag is a large soft-shell cargo carrier made from 840D vinyl. It measures 72 x 48 x 20 inches and weighs 16.5 pounds. It fits vehicles with or without crossbars and includes multiple strap configurations, a car roof mat, and a combo lock. This bag suits you if you need maximum soft-shell capacity for bulky gear.
Pros
- 40 cu ft capacity is among the largest soft-shell options available
- Made from abrasion-resistant 840D vinyl with waterproof zippers and reinforced seams
- Includes 3 buckle straps, 3 ratchet straps, 6 door hooks, 2 trunk hooks, a roof mat, a combo lock, and a carry bag
- Fits vehicles with or without crossbars or roof racks
- Backed by a 10-year limited warranty
Cons
- Soft-shell design offers less security than a hard-shell box
- No built-in locking mechanism beyond the included combo lock for the zipper
- Requires assembly of multiple straps and hooks for installation
Good fit if
- You need to carry bulky, lightweight items like sleeping bags, tents, or luggage
- You want a waterproof soft carrier that works on vehicles without roof racks
- You prefer a complete kit with straps, hooks, and a protective mat included
Skip if
- You want a hard-shell box for secure, lockable storage
- You need a carrier that installs quickly with no assembly
- You have limited roof space and do not need the full 40 cu ft capacity
Verdict: Mockins 40 cu ft XXL Soft-Shell Roof Bag is a practical choice if you need maximum soft-shell capacity and a complete installation kit, but its soft design and assembly requirements mean it is not ideal for those seeking hard-shell security or instant setup.
Mockins XXL 50 Cu Ft Roof Bag
Best for: maximum capacity on bare car roofs
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 50 cu ft
- Shell Type
- Soft-shell
- Water Resistance
- Waterproof
- Vehicle Compatibility
- No roof rack needed
- Dimensions
- 85 x 50 x 20 in
The Mockins XXL 50 Cu Ft Soft-Shell Cargo Bag provides massive overhead storage without requiring a pre-installed roof rack. Measuring 85 by 50 by 20 inches, it offers 50 cubic feet of volume built from 840D waterproof vinyl with heat-welded seams. If you need maximum packing space on your car roof for large luggage loads, this soft carrier handles bulky gear.
Pros
- 50 cubic feet of cargo capacity
- Works without a roof rack using included ratchet straps and door hooks
- Heavy-duty 840D vinyl construction with heat-welded seams
- Backed by a 10-year limited warranty
Cons
- Large 85 by 50-inch footprint requires substantial roof length and width
- Soft-shell design lacks rigid impact protection of a hard box
Good fit if
- You need 50 cubic feet of storage without installing roof crossbars.
- You have a vehicle with a roof large enough to support an 85 by 50-inch base.
- You want a full kit including straps, door hooks, a mat, and a lock.
Skip if
- You prefer a rigid hard-shell box over a flexible soft-shell bag.
- You drive a compact car with a roof shorter than 85 inches.
Verdict: Mockins XXL 50 Cu Ft Soft-Shell Cargo Bag delivers expansive 50-cubic-foot overhead storage for drivers needing maximum packing volume on a bare vehicle roof.
DNA Motoring 11 cu ft Roof Box
Best for: light, lockable car-top storage on cross bars
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 11 cu. ft.
- Shell Type
- ABS
- Opening
- side
- Load Capacity
- 110 lbs
- Security
- key and lock
This hard-shell roof box from DNA Motoring adds 11 cubic feet of lockable storage to your car. It mounts to existing cross bars with no tools required. The ABS shell holds up to 110 pounds evenly distributed. It suits drivers who want a simple, secure side-opening box for lighter gear.
Pros
- Side opening for easy access from either side of the car
- Lockable with included key to secure your cargo
- No-tool installation on vehicles with cross bars
- Impact-resistant ABS construction protects contents from weather
Cons
- Only 11 cu. ft. capacity is smaller than many soft-shell bags on this list
- 110 lb load limit is lower than some other hard-shell models
- No remote or integrated lighting listed in the specs
Good fit if
- You want a hard-shell box that locks and requires no tools to install
- You carry lightweight items and need only 11 cu. ft. of extra space
- You prefer a side-opening box for loading from the curb
Skip if
- You need more than 11 cu. ft. of cargo capacity
- You carry heavy gear like camping equipment that exceeds 110 lbs
- You want a box that opens from the rear or has a dual-side opening
Verdict: DNA Motoring 11 cu ft Roof Box is a straightforward, lockable hard-shell box for light cargo, but its 11 cu. ft. capacity and 110 lb limit make it best for smaller loads.
Auto Dynasty Hard Shell 15 cu ft Roof Box
Best for: car owners wanting a secure hard-shell roof box
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 15 cu ft
- Shell Type
- ABS
- Opening
- passenger side
- Load Capacity
- 110 lb
- Water Resistance
- weather-resistant
The Auto Dynasty Hard Shell Roof Box offers 15 cubic feet of storage with a 110-pound weight limit. It measures 80 inches long, 30 inches wide, and 13 inches high. The ABS shell is weather-resistant and UV-protected. A key lock secures your gear, and the passenger-side opening makes loading easy. It installs tool-free on crossbars up to 13 inches wide. This box suits drivers who want a hard-shell alternative to soft bags on this list.
Pros
- Hard-shell ABS construction for impact and weather resistance
- Key lock system secures contents during travel
- Tool-free installation with included mounting brackets
- Passenger-side opening for convenient curbside loading
- 110-pound load capacity handles typical family luggage
Cons
- 15 cu ft capacity is smaller than many soft-shell bags on this list
- Only 13 inches tall, limiting space for bulky items like strollers
- No remote or dual-side opening listed
Good fit if
- You want a hard-shell roof box for better security and durability than a soft bag
- You have crossbars up to 13 inches wide and prefer tool-free mounting
- You need a compact box that fits a car with limited roof space
Skip if
- You need more than 15 cubic feet of cargo capacity
- You plan to carry tall items that require a box over 13 inches in height
- You want a box that opens from both sides of the vehicle
Verdict: Auto Dynasty Hard Shell 15 cu ft Roof Box is a solid hard-shell choice for car owners who want secure, weather-resistant storage with easy tool-free installation, though its capacity and height are modest compared to larger soft bags.
PM Performotor 11 cu ft Hard Shell Cargo Box
Best for: car owners wanting a compact, secure hard-shell roof box
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 11 Cubic Feet
- Shell Type
- ABS plastic
- Opening
- opens to 14" wide
- Load Capacity
- 110lbs
- Security
- key and lock
View on Amazon: PM Performotor 11 cu ft Hard Shell Cargo Box
This is a compact hard-shell roof box with 11 cubic feet of storage and a 110-pound load limit. It is made from impact-resistant ABS plastic and includes a locking system for security. The aerodynamic shape is designed to reduce wind noise and fuel consumption. It suits car owners who want a durable, weatherproof alternative to soft bags for shorter trips or lighter loads.
Pros
- Impact-resistant ABS plastic shell for long-term durability
- Lockable with key for secure cargo storage
- Aerodynamic shape to reduce wind noise and fuel consumption
- Tool-free or simple installation with included brackets
Cons
- 11 cubic feet capacity is smaller than many soft-shell roof bags
- 110-pound max load is lower than some hard-shell competitors
- Only 14-inch opening width may limit access to larger items
Good fit if
- You want a hard-shell roof box for occasional weekend trips
- You prefer a lockable, weatherproof carrier over a soft bag
- You drive a car with factory or aftermarket cross bars
Skip if
- You need more than 11 cubic feet of cargo space
- You plan to carry heavy gear exceeding 110 pounds
- You require a larger opening for bulky items like skis or luggage
Verdict: PM Performotor 11 cu ft Hard Shell Cargo Box is a compact, lockable hard-shell option for car owners who need basic weatherproof storage without the bulk of larger boxes.
SR1 Performance 20 Cu Ft Roof Bag with Jeep Logo
Best for: Car and Jeep owners wanting rack-free soft storage
- Vehicle Type
- Car, SUV, Jeep (what this guide is about)
- Capacity
- 20 Cu Ft
- Shell Type
- PVC
- Water Resistance
- 100% Waterproof
- Security
- Combination lock
- Installation
- Straps and hooks, anti-slip mat
View on Amazon: SR1 Performance 20 Cu Ft Roof Bag with Jeep Logo
The SR1 Performance 20 Cu Ft Rooftop Cargo Bag expands your car or Jeep cargo capacity without requiring permanent roof rails. Built from PVC with welded seams, it measures 44 by 34 by 17 inches and weighs 8.8 pounds. It includes an anti-slip mat, door hooks, and a combination lock, fitting drivers who need weather-resistant storage that folds down flat.
Pros
- 20 cubic feet of volume with a 44 by 34 by 17 inch footprint
- Works on vehicles with or without roof racks using six door hooks
- Constructed from tear-resistant PVC with high-frequency welded seams
- Includes anti-slip mat, combination lock, and dedicated storage bag
Cons
- Soft PVC shell lacks the rigid structural protection of hard-shell roof boxes
- Smaller capacity than 30- to 50-cubic-foot rooftop carrier bags
Good fit if
- You drive a car, SUV, or Jeep without dedicated roof crossbars
- You need a complete kit with an included anti-slip mat and lock
- You want soft-shell storage that packs away into a storage bag
Skip if
- You prefer a rigid hard-shell cargo carrier for solid exterior protection
- You need more than 20 cubic feet of cargo capacity for family gear
Verdict: SR1 Performance 20 Cu Ft Rooftop Cargo Bag gives vehicle owners a rack-free roof carrier bundled with tie-down hardware and a security lock. It suits drivers who prioritize compact off-season storage and all-weather soft-shell hauling.
Relaxcabine 14 Cu Ft Hard Shell Roof Box
Best for: mid-size cargo storage with dual-side access
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 14 cubic feet
- Shell Type
- ABS + PMMA
- Opening
- Dual-side
- Load Capacity
- 150 lbs
- Water Resistance
- Waterproof
This hard-shell carrier gives you 14 cubic feet of enclosed storage with a 150-pound load limit. Built from ABS and PMMA plastics, it measures 62.5 by 32.5 by 13.2 inches and weighs 30.2 pounds. The tool-free hardware fits round, square, and aerodynamic crossbars. It suits your car if you need secure, dual-side access for camping gear or luggage.
Pros
- Dual-side opening with support arms for access from either side
- Multi-point safety lock retains the key until fully secured
- Tool-free mounting compatible with round, square, and aerodynamic bars
- 150-pound load capacity inside an impact-resistant ABS and PMMA shell
Cons
- 14 cubic feet provides less volume than soft cargo carriers on the list
- 13.2-inch exterior height limits clearance for taller bulky items
Good fit if
- You want dual-side opening to load gear from either side of your car.
- You need a hard-shell carrier rated to carry up to 150 pounds.
- You use round, square, or aerodynamic crossbars and want tool-free mounting.
Skip if
- You need more than 14 cubic feet of volume for oversized cargo.
- You pack rigid gear measuring longer than 62.5 inches.
Verdict: Relaxcabine 14 Cu Ft Hard Shell Roof Box suits car owners who want a lockable, rigid cargo container with dual-side loading and standard 150-pound capacity. It fits travelers who prefer quick tool-free mounting over massive soft-bag volume.
Mockins 50 CuFt XXL Heavy-Duty Roof Bag
Best for: Maximum soft-shell cargo capacity without roof racks
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 50 Cubic Feet
- Shell Type
- Vinyl
- Water Resistance
- Waterproof
- Security
- Combo lock
- Vehicle Compatibility
- No roof rack needed
This soft-shell rooftop cargo bag provides 50 cubic feet of storage across an 85 by 50 by 20-inch vinyl footprint. It mounts directly to vehicles without roof racks using included ratchet straps, buckle straps, and door hooks. It suits you if you need massive extra cargo volume for bulky gear without installing dedicated crossbars on your car.
Pros
- 50 cubic feet of enclosed storage capacity
- Installs on vehicles without roof racks or crossbars
- Includes 3 ratchet straps, 3 buckle straps, 8 hooks, and an anti-slip mat
- Backing includes a 10-year limited warranty
Cons
- 85-inch length requires a long roof line
- Soft vinyl shell lacks the rigid impact protection of a hard box
Good fit if
- You need high cargo capacity without installing roof racks.
- You drive a vehicle with a roof long enough to clear an 85-inch footprint.
Skip if
- You prefer a rigid, hard-shell cargo box.
- You drive a compact car with a short roof profile.
Verdict: Mockins XXL 50 Cu Ft Rooftop Cargo Bag suits drivers needing maximum hauling volume on vehicles without permanent roof racks or crossbars.
VISRACK 13 cu ft Hard Shell Roof Box
Best for: compact hard shell storage with dual-side access
- Vehicle Type
- Car (what this guide is about)
- Capacity
- 13 cu ft
- Shell Type
- Hard shell (ABS and PMMA)
- Opening
- Dual-side
- Load Capacity
- 130 lb
- Installation
- Tool-free
The VISRACK 13 cu ft hard shell roof box gives you a compact, secure cargo solution for your car. It has a 130-lb load capacity and measures 55.9 x 29.5 x 15 inches. Dual-side opening makes loading easy from either side. The double lock system keeps your gear safe. It fits round, square, and aerodynamic crossbars with tool-free installation. This box suits drivers who want a smaller, hard-sided carrier for everyday trips.
Pros
- Hard shell construction from impact-resistant ABS and PMMA materials
- Dual-side opening for easy access from either side of the car
- Double lock system with automatic super latch for security
- Tool-free assembly for quick installation
- Fits round, square, and aerodynamic crossbars
Cons
- 13 cu ft capacity is smaller than many soft-shell roof bags on this list
- 15-inch height limits loading of taller items compared to deeper boxes
- No remote or keyless entry listed for the lock system
Good fit if
- You want a hard shell roof box for better weather protection than a soft bag
- You need dual-side access to load gear from either side of your car
- You prefer tool-free installation and a compact size for smaller vehicles
Skip if
- You need more than 13 cu ft of cargo capacity for large loads
- You want a roof box with a taller profile to fit bulky items like camping chairs
- You require a lock system with keyless entry or remote control
Verdict: VISRACK 13 cu ft Hard Shell Roof Box is a compact, secure hard shell option for car owners who want easy dual-side access and tool-free setup, though its smaller capacity and lower height may not suit larger loads.
Mockins 30 cu ft Soft-Shell Vinyl Roof Bag
Best for: large-capacity waterproof roof bag with full accessory kit
- Vehicle Type
- Car, SUV, Truck (what this guide is about)
- Capacity
- 30 cu ft
- Shell Type
- soft-shell vinyl
- Water Resistance
- waterproof
- Security
- combination lock
- Vehicle Compatibility
- vehicles with or without roof rack
This soft-shell vinyl roof bag provides 30 cubic feet of cargo space (60x43x20 inches). It is waterproof with a protected zipper and welded seams. The kit includes a roof mat, door hooks, straps, and a combination lock. It works on vehicles with or without a roof rack, making it a flexible option for cars, SUVs, and trucks.
Pros
- 30 cu ft capacity (60x43x20 in) for bulky gear
- Waterproof vinyl shell with welded seams and protected zipper
- Includes roof mat, door hooks, ratchet straps, and combination lock
- Compatible with vehicles that have or lack a roof rack
- Folds into its own carry case for storage
Cons
- Soft-shell design offers less security than a hard-shell box
- No crossbars included; requires separate purchase if vehicle lacks them
- Heavier than some soft bags at 15.5 pounds
Good fit if
- You want a large, waterproof soft bag that works with or without roof racks
- You need a complete kit with mounting accessories and a lock
- You plan to store the bag compactly when not in use
Skip if
- You prefer the rigid security of a hard-shell cargo box
- You need a bag that weighs under 10 pounds for easy handling
- You require a roof-mounted carrier with integrated crossbars
Verdict: Mockins 30 cu ft Soft-Shell Vinyl Roof Bag is a practical, large-capacity soft bag with waterproof construction and a full accessory kit, suitable for cars, SUVs, and trucks with or without roof racks.
MCBD 40 cu ft Soft-Shell Roof Bag
Best for: Large car roofs needing bare-roof gear storage
- Vehicle Type
- Car, SUV (what this guide is about)
- Capacity
- 40 cu ft
- Shell Type
- soft-shell, 900D PVC tarpaulin
- Water Resistance
- 100% waterproof
- Security
- combination lock
- Dimensions
- 72 x 48 x 20 in
The MCBD 40 Cu Ft Soft-Shell Rooftop Cargo Bag expands your vehicle storage with 40 cubic feet of capacity. Made from 900D PVC tarpaulin, this waterproof carrier measures 72 by 48 by 20 inches and secures with ratchet straps and door hooks. It suits travelers packing bulky gear onto cars with roofs measuring at least 68 inches long by 45 inches wide.
Pros
- Offers 40 cubic feet of enclosed storage volume
- Built from thick 900D PVC tarpaulin material
- Mounts to bare roofs or crossbars with included door hooks and ratchet straps
- Includes a protective anti-slip mat, storage bag, and combination lock
Cons
- Requires a large car roof area of at least 68 by 45 inches
- Soft-shell design lacks the rigid outer shell of a hard box
- Total capacity is smaller than 50-cubic-foot oversized carriers
Good fit if
- You drive a vehicle with a roof measuring 68 to 80 inches long and 45 to 52 inches wide.
- You want to mount extra luggage on a bare roof without installed crossbars.
- You need a foldable carrier that packs away into a storage bag when empty.
Skip if
- You drive a compact vehicle with a roof footprint smaller than 68 by 45 inches.
- You want a rigid hard-shell cargo container for added structure.
Verdict: MCBD 40 Cu Ft Soft-Shell Rooftop Cargo Bag serves drivers who need 40 cubic feet of weather-resistant space on larger vehicle roofs without requiring dedicated crossbars.
Specifications side by side
| Spec | MeeFar 21 cu ft Waterproof Roof Bag | Sailnovo 21 cu ft Soft Roof Bag | RoofPax 19 cu ft Polyester Roof Bag | Asinking 20 cu ft Waterproof Roof Bag | Mockins 40 cu ft XXL Roof Bag | Mockins XXL 50 Cu Ft Roof Bag | DNA Motoring 11 cu ft Roof Box | Auto Dynasty Hard Shell 15 cu ft Roof Box | PM Performotor 11 cu ft Hard Shell Cargo Box | SR1 Performance 20 Cu Ft Roof Bag with Jeep Logo | Relaxcabine 14 Cu Ft Hard Shell Roof Box | Mockins 50 CuFt XXL Heavy-Duty Roof Bag | VISRACK 13 cu ft Hard Shell Roof Box | Mockins 30 cu ft Soft-Shell Vinyl Roof Bag | MCBD 40 cu ft Soft-Shell Roof Bag |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Capacity | 21 cu ft | 21 cubic feet | 19 Cubic feet | 20 cu ft | 40 cu ft | 50 cu ft | 11 cu. ft. | 15 cu ft | 11 Cubic Feet | 20 Cu Ft | 14 cubic feet | 50 Cubic Feet | 13 cu ft | 30 cu ft | 40 cu ft |
| Shell Type | 800D PVC tarpaulin | Soft Shell | polyester | 900D PVC tarpaulin | 840D vinyl | Soft-shell | ABS | ABS | ABS plastic | PVC | ABS + PMMA | Vinyl | Hard shell (ABS and PMMA) | soft-shell vinyl | soft-shell, 900D PVC tarpaulin |
| Opening | not specified | not specified | not specified | not specified | not specified | not specified | side | passenger side | opens to 14" wide | not specified | Dual-side | not specified | Dual-side | not specified | not specified |
| Load Capacity | not specified | not specified | not specified | not specified | not specified | not specified | 110 lbs | 110 lb | 110lbs | not specified | 150 lbs | not specified | 130 lb | not specified | not specified |
| Water Resistance | 100% waterproof | Waterproof | 100% waterproof | 100% waterproof | waterproof | Waterproof | not specified | weather-resistant | not specified | 100% Waterproof | Waterproof | Waterproof | not specified | waterproof | 100% waterproof |
| Security | combination lock | not specified | not specified | Lock | not specified | not specified | key and lock | key lock | key and lock | Combination lock | Safety key system | Combo lock | not specified | combination lock | combination lock |
| Installation | not specified | Tie-Down Strap | door hook straps, 10 straps | Metal ring strap design | not specified | not specified | no tool assembly | tool-free | tool-free or simple installation | Straps and hooks, anti-slip mat | Tool-free | not specified | Tool-free | not specified | not specified |
| Vehicle Compatibility | with or without roof rack | not specified | fits cars with or without roof rack | With or without roof rack | not specified | No roof rack needed | fits vehicles with cross bars only | max 13 in wide cross bar | not specified | not specified | not specified | No roof rack needed | Fits round, square, and aerodynamic bars | vehicles with or without roof rack | not specified |
| Dimensions | 47 x 35 x 22 in | 9.84 x 7.09 x 13.8 in | 47.2 x 35.4 x 19.8 in | 52 x 40 x 12-18.5 in | 72 x 48 x 20 in | 85 x 50 x 20 in | 53" L x 34" W x 15" H | 80 x 30 x 13 in | 53"L x 34"W x 15"H | 44 x 34 x 17 in | 62.5 x 32.5 x 13.2 in | 85 x 50 x 20 in | 55.9 x 29.5 x 15 in | 60 x 43 x 20 in | 72 x 48 x 20 in |
| Recommended Use | not specified | not specified | not specified | not specified | not specified | Tents, sleeping bags, suitcases | not specified | not specified | not specified | not specified | Luggage, gear, camping equipment | Tents, sleeping bags, suitcases | not specified | not specified | not specified |
| Vehicle Type | Car | Car | Car | Car | Car | Car | Car | Car | Car | Car, SUV, Jeep | Car | Car | Car | Car, SUV, Truck | Car, SUV |
| Size | 21 Cubic Feet | 21 Cubic Feet | 19 Cubic feet | 20 Cubic Feet | 40 Cubic Feet | 50 Cubic Feet | 11 cu. ft. | 15 Cubic Feet | 11 Cubic Feet | not specified | 14 Cu Ft Black | 50 Cubic Feet | 13Cubic | 30 Cubic Feet | 40 Cubic Feet |
| Mount Type | Roof Mount | Roof Mount | Roof Mount | Roof Mount | not specified | Roof Mount | Roof Mount | not specified | Roof Mount | Roof Mount | not specified | Roof Mount | Roof Mount | Roof Mount | Roof Mount |
| Lockable | not specified | not specified | not specified | Lockable | not specified | not specified | Lockable | not specified | not specified | Lockable | Lockable | not specified | not specified | not specified | not specified |
| Includes Bag | not specified | not specified | not specified | not specified | not specified | With Bag | not specified | not specified | not specified | With Bag | not specified | not specified | not specified | With Bag | With Bag |
| Weight | 10.7 pounds | 8.16 pounds | 12.4 pounds | not specified | 16.5 pounds | 19 pounds | not specified | not specified | not specified | 8.8 pounds | 30.2 pounds | 18 pounds | 27.8 pounds | 15.5 pounds | 16.3 pounds |
| Color | Orange | Black | ['Black', 'Orange', 'Grey'] | Black with Blue | Black | Black | Textured Black | Textured Black- A | Textured Black | Black | Black | Black | Black | Black/Orange | Blue |
| Model | 21 Cubic Feet | Sailnovo5033-FR | Rooftop_Cargo_Carrier | rooftop cargo bag | MA-RB-40BLK-72X48X20-89 | MA-RB-50BLK-85X50X20-94 | PT-ZTL-8166-BK | not specified | PM-64342 | MP-27200 | Car Rooftop Cargo Box 14 Cu Ft Black | MA-RB-50BLK-85X50-94-V1-LOC | B-56 | MA-RB-30OR-88-V1 | 40cf |
Is a Car Roof Box Worth It?
All 15 products on this list are designed for cars. This means they are sized and shaped to fit the rooflines of sedans, hatchbacks, and coupes. Soft-shell bags mount without a roof rack, while hard-shell boxes require cross bars. For daily use, a car-specific roof box adds cargo space without sacrificing interior passenger room. The trade-off is reduced overhead clearance and increased wind noise. If you have a car and need extra luggage capacity for trips, a roof box is a practical solution.
Worth it if
- You drive a car and need extra cargo space for road trips or family vacations.
- You want a roof bag that installs without a roof rack.
- You prefer a hard-shell box for secure, lockable storage.
Skip it if
- You own an SUV, minivan, or truck that already has ample interior cargo space.
- You regularly park in a low garage or carport with limited overhead clearance.
- You need to carry tall items that exceed the height of a roof box.
When planning vehicle storage and interior audio, you can compare specifications for the best subwoofers for cars.
How we picked these roof carriers
We started with Amazon listings that explicitly state "Vehicle Type: Car" in the title or feature list. That is the core feature of this guide. Every product on this page matches that spec.
To order the list, we first show in-stock products, then sort by the listing's overall rating weighted by the number of ratings, followed by how many of our guide's criteria are met. Only one size or variant per product family is included. All details come from published specs and features; we do not handle the products. Prices and stock update live on the page.
How to Choose the Right Roof Cargo Box
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Shell Type: Soft vs Hard
Soft-shell bags are lightweight, foldable, and often mount without a roof rack. They offer high volume for the cost, but provide less security and can flap at speed. Hard-shell boxes are rigid, lockable, and more aerodynamic, but require cross bars and are heavier. If you need maximum capacity and don't own a rack, a soft bag like the Mockins 40 cu ft XXL is practical. If security and durability matter, choose a hard shell.
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Capacity and Size
Capacity ranges from 11 to 40 cubic feet on this list. Consider your vehicle's roof dimensions and weight limit. A larger box holds more gear but adds height, which may not clear garages. For occasional trips, 15 to 21 cubic feet is often enough. For family vacations, 30 to 40 cubic feet suits bulky items. Always measure your roof length and width before buying.
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Mount Compatibility
Most soft-shell bags include straps that attach directly to the car's roof or door frames, so no rack is needed. Hard-shell boxes require cross bars. Check your vehicle's roof type: bare roof, raised rails, or factory cross bars. Some products, like the RoofPax 19 cu ft, work with or without racks. Read the mount type spec to confirm fit before purchase.
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Water Resistance
All products on this list claim waterproof construction, but materials vary. Soft bags use PVC, vinyl, or polyester with welded seams. Hard shells are molded plastic. For heavy rain, a hard shell offers better long-term protection. Soft bags like the Asinking 20 cu ft are tested for waterproofing but may leak if overstuffed or poorly sealed. Look for a waterproof rating or material description in the specs.
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Security Features
Soft-shell bags typically use zippers that can be secured with a small padlock, but the fabric itself can be cut. Hard-shell boxes have built-in locking mechanisms and are more tamper-resistant. If you leave gear unattended, a hard shell like the Auto Dynasty 15 cu ft is safer. For short stops, a soft bag with a lockable zipper may suffice. Check the lockable attribute in the specs.
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Weight and Load Limit
Roof load capacity includes the carrier plus cargo. Check your vehicle's roof weight limit in the owner's manual. Soft bags weigh 8 to 16 pounds, leaving more room for gear. Hard shells weigh 27 to 30 pounds, reducing available payload. For example, the DNA Motoring 11 cu ft box has a 110 lb load limit. Never exceed your vehicle's dynamic roof load rating, which is usually lower than the static rating.
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Setup and Storage
Soft-shell bags fold flat for storage when not in use, saving garage space. They take 10 to 20 minutes to install with straps. Hard shells are bulky to store and require two people to mount. They offer faster daily setup once installed. Consider how often you will use the carrier. If you need it only a few times a year, a soft bag is more convenient to store. If you use it weekly, a hard shell saves time.
Frequently asked questions
What is the highest weight capacity listed for a hard-shell roof box?
The Relaxcabine 14 Cu Ft Hard Shell Roof Box has the highest stated rating at 150 pounds. In comparison, the DNA Motoring 11 cu ft Roof Box lists a load capacity of 110 pounds. Always check your car roof limits before loading cargo to ensure you stay within safe specifications.
Can you lock a roof cargo carrier for security?
Yes, several models include locking features. Hard-shell units like the DNA Motoring 11 cu ft Roof Box and Relaxcabine 14 Cu Ft provide lockable designs. Certain soft options also specify lock compatibility, including the Asinking 20 cu ft bag and the SR1 Performance 20 Cu Ft Roof Bag, keeping your gear secured.
How much cargo volume do hard-shell roof boxes provide compared to soft bags?
Hard-shell models on this list range from 11 to 15 cubic feet, while soft bags offer between 19 and 50 cubic feet. For instance, the Auto Dynasty Hard Shell provides 15 cubic feet of storage. The Mockins XXL soft-shell carriers reach up to 50 cubic feet for larger cargo needs on your car.
Which roof carrier option is the lightest to lift onto a car?
The Sailnovo 21 cu ft Soft Roof Bag is the lightest carrier listed, weighing 8.16 pounds. The SR1 Performance 20 Cu Ft bag is also lightweight at 8.8 pounds. In contrast, rigid units like the Relaxcabine 14 Cu Ft box weigh 30.2 pounds, requiring more effort when you lift them.
Which hard-shell roof boxes feature dual-side opening?
The Relaxcabine 14 Cu Ft Hard Shell Roof Box features dual-side opening for loading access from either side of your vehicle. Dual-side opening allows you to reach gear without stretching across the car roof. The VISRACK 13 cu ft model also provides dual-side access with its 55.9-inch length and 15-inch height profile.
What is the longest roof carrier available for a car on this list?
The Mockins XXL 50 Cu Ft Roof Bag models are the longest options, measuring 85 inches in length. For hard-shell containers, the Auto Dynasty Hard Shell 15 cu ft Roof Box is the longest at 80 inches. You should measure your car roof length to ensure these longer carriers do not overhang.