6 Best Alternatives to the Mockins 40 CuFt XXL Car (2026)
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The Mockins 40 CuFt XXL Car offers 40 cubic feet of soft-shell storage in a 72x48x20 inch footprint. It uses 840D vinyl for waterproof protection and secures to vehicles without roof racks. You might seek mockins 40 cuft xxl car alternatives if you need a different capacity, a more compact profile, or a distinct brand. Some drivers prefer lighter bags or specific colors. Others want a tighter fit for smaller sedans or SUVs. This list compares seven options that share key specifications with the original. All listed products are soft-shell roof bags designed for car use. They vary in volume, weight, and exact dimensions. We selected these alternatives because their core specs overlap with the Mockins model. You can compare capacities ranging from 19 to 40 cubic feet. The selection highlights options for vehicles with or without existing roof rails. Each product provides waterproof storage for your gear. The choices focus on practical differences in size and material. You can find a solution that matches your specific roof width and cargo volume needs.
Our top pick: Mockins 40 cu ft XXL Roof Bag.
Comparing key specs and fit
Sailnovo 21 cu ft Soft Roof Bag
The Sailnovo 21 cu ft bag offers half the storage volume of the Mockins 40 cu ft model, with dimensions of 9.84 x 7.09 x 13.8 inches when packed. It weighs just 8.16 pounds, making it significantly lighter and easier to handle than the 16.5 pound Mockins. You lose capacity, gaining a compact profile that is simpler to store in your garage. This option suits drivers who carry less gear and want a lighter, more manageable solution for weekend trips without sacrificing waterproof protection.
MCBD 40 cu ft Soft-Shell Roof Bag
The MCBD 40 cu ft bag matches the Mockins capacity but comes in blue instead of black. It weighs slightly less at 16.3 pounds compared to the Mockins 16.5 pounds. The listed dimensions are unclear, but the volume remains identical for large cargo loads. You get the same spacious interior for bulky items like tents or luggage. This alternative is ideal if you prefer a different color scheme or want a budget-friendly soft-shell option that provides the same maximum storage space for wide vehicle roofs.
RoofPax 19 cu ft Polyester Roof Bag
The RoofPax 19 cu ft bag is much smaller than the Mockins 40 cu ft, measuring 47.2 x 35.4 x 19.8 inches. It weighs 12.4 pounds, which is lighter and sits lower on the roof. You sacrifice more than half the storage volume for a sleeker, more aerodynamic profile that fits smaller sedans better. This choice is best for drivers who prioritize a tight, secure fit and moderate cargo space over maximum capacity, ensuring better fuel efficiency and stability on the highway.
Asinking 20 cu ft Waterproof Roof Bag
The Asinking 20 cu ft bag provides half the storage of the Mockins 40 cu ft model, with dimensions of 52 x 40 x 18.5 inches. It is designed for smaller vehicles and lighter loads. You gain a more compact footprint that is easier to manage on cars with lower weight limits. This option suits drivers who need waterproof, lockable storage for weekend gear without the bulk of an XXL bag, offering a practical balance of capacity and ease of use for everyday travel.
Mockins 40 cu ft XXL Soft-Shell Roof Bag
The second Mockins 40 cu ft bag is nearly identical to the original, with the same 72 x 48 x 20 inch dimensions and 40 cubic feet capacity. It weighs slightly less at 15.7 pounds compared to the 16.5 pound original. The main difference is the color, which is black and orange instead of all black. You get the same flexible, rack-free installation and waterproof protection. This variant is a great alternative if you prefer a two-tone look while maintaining the same high-capacity performance and durable soft-shell construction.
BagMate 23 cu ft Roof Bag – 840D PVC
The BagMate 23 cu ft bag offers less capacity than the Mockins 40 cu ft model, measuring 55 x 44.9 x 19.5 inches. It weighs 13.1 pounds, making it lighter and easier to install. You give up significant storage volume for a more manageable size that fits medium-sized vehicles well. This option is best for drivers who need reliable waterproof storage for moderate loads but do not require the maximum space of an XXL bag, providing a practical middle ground for regular family trips.
Quick picks
Our 7 picks
Mockins 40 cu ft XXL Roof Bag
Best for: maximum storage without roof racks
- Capacity
- 40 cu ft
- Shell Type
- 840D vinyl
- Water Resistance
- waterproof
- Dimensions
- 72 x 48 x 20 in
- Vehicle Type
- Car
- Weight
- 16.5 pounds
This Mockins roof bag offers 40 cubic feet of storage in a soft-shell design. Measuring 72 by 48 by 20 inches, it fits vehicles with or without crossbars. The 840D vinyl shell provides waterproof protection. It includes ratchet straps, door hooks, and a roof mat for secure installation. You get a complete kit for hauling gear without needing existing roof racks.
Pros
- Generous 40 cubic feet capacity
- Waterproof 840D vinyl construction
- Fits vehicles without crossbars
- Includes 3 buckle and 3 ratchet straps
Cons
- Heavier at 16.5 pounds than soft bags
- Bulky 20-inch height profile
- No mention of aerodynamic shaping
Good fit if
- You need maximum storage space
- Your car lacks roof racks
- You require waterproof gear protection
Skip if
- You prefer a low-profile design
- You want a lighter carry weight
- You need a hard-shell carrier
Verdict: Mockins 40 CuFt Soft-Shell Roof Bag is a high-capacity solution for those without roof racks. It suits buyers who prioritize storage volume and waterproof durability over a sleek profile.
Sailnovo 21 cu ft Soft Roof Bag
Best for: cars without roof rails needing compact storage
- 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
- Vehicle Type
- Car
This Sailnovo roof bag offers 21 cubic feet of storage in a soft-shell design. It measures 72 by 48 by 20 inches when installed and weighs 8.16 pounds. The waterproof construction uses tie-down straps for mounting. It fits cars without roof rails. You should consider this if you need a lightweight, compact carrier for smaller loads.
Pros
- 21 cubic feet capacity
- Waterproof soft-shell material
- Lightweight at 8.16 pounds
- Fits cars without roof rails
Cons
- Smaller 21 cubic feet capacity compared to 40 cubic feet alternatives
- Soft-shell design offers less rigid protection than hard cases
- Requires manual tie-down strap installation
Good fit if
- You have a car without roof rails
- You need a lightweight storage option
- You have moderate cargo volume needs
Skip if
- You require maximum 40 cubic feet capacity
- You prefer a rigid hard-shell case
- You need integrated locking mechanisms
Verdict: Sailnovo 21 CuFt Soft-Shell Roof Bag provides a compact, waterproof solution for drivers without roof rails. It suits those prioritizing low weight and easy storage over maximum volume.
MCBD 40 cu ft Soft-Shell Roof Bag
Best for: wide roofs needing large volume
- 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
- Vehicle Type
- Car, SUV
This MCBD roof bag offers 40 cubic feet of capacity with dimensions of 72 x 48 x 20 inches. It uses 900D PVC tarpaulin for 100% waterproof protection. The soft-shell design folds for storage. It includes ratchet straps, door hooks, and an anti-slip mat. You need a roof width between 45 and 52 inches. It suits SUVs and trucks needing large cargo space.
Pros
- 40 cubic feet capacity
- 72 x 48 x 20 inch dimensions
- 900D PVC tarpaulin material
- Includes combination lock
- Comes with anti-slip mat
Cons
- 16.3 pounds weight
- Requires roof width of 45-52 inches
- No hard-shell impact protection
Good fit if
- You need maximum cargo volume
- You have wide cross bars
- You want waterproof soft-shell storage
Skip if
- Your roof width is under 45 inches
- You prefer hard-shell carriers
- You need compact folded size
Verdict: MCBD 40 CuFt Soft-Shell Roof Bag fits travelers who prioritize volume over ruggedness. It works best for wide roofs needing large, waterproof storage.
RoofPax 19 cu ft Polyester Roof Bag
Best for: Sedans and small SUVs needing secure storage
- 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
- Dimensions
- 47.2 x 35.4 x 19.8 in
This RoofPax bag offers 19 cubic feet of storage in a compact 47.2 x 35.4 x 19.8 inch footprint. It weighs 12.4 pounds and uses a polyester shell for weather protection. The design includes dual zippers and patented 4-door hook straps for secure mounting on vehicles with or without racks. It suits drivers needing moderate capacity without the bulk of larger XXL options.
Pros
- Patented 4-door hook straps for secure attachment
- Dual zipper system for enhanced waterproofing
- Polyester shell is lighter than PVC alternatives
- Fits vehicles with or without roof racks
Cons
- 19 cubic feet capacity is smaller than the 40 CuFt alternatives
- Weighs 12.4 pounds, adding more mass than soft bags
- No mention of integrated tie-down points for additional security
Good fit if
- You need a secure fit for a sedan or small SUV
- You prefer a lighter bag that is easier to handle
- You want a waterproof bag with dual zippers
Skip if
- You require the maximum 40 cubic feet capacity
- You have a large SUV needing XXL storage
- You need a bag that expands beyond 19 cubic feet
Verdict: RoofPax 19 CuFt Waterproof Roof Bag is a secure, weather-ready option for drivers who prioritize a tight fit and moderate cargo space over maximum volume.
Asinking 20 cu ft Waterproof Roof Bag
Best for: compact waterproof storage on smaller vehicles
- Capacity
- 20 cu ft
- Shell Type
- 900D PVC tarpaulin
- Water Resistance
- 100% waterproof
- Security
- Lock
- Installation
- Metal ring strap design
- Vehicle Compatibility
- With or without roof rack
The Asinking 20 cubic feet roof bag is a soft-shell carrier made from 900D PVC tarpaulin. It measures 52 x 40 x 12-18.5 inches and offers 100% waterproof protection with triple-reinforced seams. The design includes a double flap for the zipper and metal ring straps for easy installation. It fits vehicles with or without roof racks, providing a secure and compact storage solution for road trips.
Pros
- 900D PVC tarpaulin shell with triple-reinforced seams
- Double flap protects zipper from water ingress
- Metal ring strap design simplifies installation
- Fits vehicles with or without roof racks
- Foldable design for compact storage when not in use
Cons
- 20 cubic feet capacity is smaller than the 40 cu ft alternatives on this list
- Soft-shell construction offers less rigid protection than hard cargo boxes
- No integrated lock mechanism mentioned in specifications
Good fit if
- You need a compact carrier for smaller vehicles or lighter loads
- You want a waterproof bag that installs easily without complex hardware
- You prefer a soft-shell design that folds flat for storage
Skip if
- You require a capacity larger than 20 cubic feet
- You need a rigid hard-shell box for maximum impact protection
- You prefer a carrier with an integrated locking system
Verdict: Asinking 20 CuFt Waterproof Roof Bag is a practical choice for drivers who prioritize waterproofing and easy installation over maximum capacity. It suits those with smaller vehicles or lighter cargo needs who want a durable, foldable solution.
Mockins 40 cu ft XXL Soft-Shell Roof Bag
Best for: large loads on vehicles without racks
- Capacity
- 40 cu ft
- Shell Type
- Soft-shell
- Water Resistance
- Waterproof
- Dimensions
- 72 x 48 x 20 in
- Recommended Use
- Suitcases, sleeping bags
- Vehicle Type
- Car
This Mockins roof bag offers 40 cubic feet of storage, measuring 72 by 48 by 20 inches. It is a soft-shell carrier made from abrasion-resistant vinyl. The design includes waterproof zippers and reinforced seams. It fits vehicles with or without crossbars. You can secure it using ratchet straps, buckle straps, or door hooks. The kit includes a roof mat and a carry bag for storage.
Pros
- Generous 40 cubic feet capacity
- Fits vehicles without roof racks
- Includes roof mat and carry bag
- Waterproof zippers under protective flap
Cons
- Heavier at 15.7 pounds
- Soft-shell material less rigid
- No mention of integrated locking system
Good fit if
- You need maximum roof storage space
- Your vehicle lacks roof crossbars
- You want a complete accessory kit
Skip if
- You prefer a hard-shell carrier
- You need a lighter carry option
- You require built-in key locks
Verdict: Mockins 40 CuFt XXL Soft-Shell Roof Bag provides ample space for large loads on vehicles without racks. It suits travelers who need a flexible, all-in-one solution for gear transport.
BagMate 23 cu ft Roof Bag – 840D PVC
Best for: moderate storage needs without roof racks
- Capacity
- 23 cu ft
- Shell Type
- 840D PVC
- Water Resistance
- 100% waterproof
- Dimensions
- 55" L x 44.9" W x 19.5" H
- Vehicle Type
- Car, SUV
- Mount Type
- Roof Mount
The BagMate 23 CuFt roof bag offers 23 cubic feet of storage in a 55x44.9x19.5 inch shell. It uses 840D PVC fabric with heat-welded seams for 100% waterproof protection. The design includes a non-slip protective mat and installs via four heavy-duty door hooks. This fits cars and SUVs without needing a roof rack. It is a practical option for travelers needing moderate extra space.
Pros
- 23 cubic feet capacity holds up to 8 medium suitcases
- 100% waterproof with triple-seal design and heat-welded seams
- Installs on vehicles without roof racks using door hooks
- Includes non-slip protective mat to prevent paint scratches
Cons
- 23 cubic feet capacity is significantly smaller than the 40 cubic feet alternatives
- 55 inch length is shorter than the 72 inch length of other options
- Requires manual strap tightening without automated tensioning systems
Good fit if
- You need moderate storage for weekend trips or light gear
- You drive a sedan or SUV without a roof rack
- You prioritize waterproof protection over maximum volume
Skip if
- You need to transport large items requiring 40 cubic feet
- You already have a roof rack and want a dedicated carrier
- You prefer a rigid hard-shell carrier over a soft bag
Verdict: BagMate 23 CuFt Roof Bag fits drivers who need reliable waterproof storage but do not require the maximum 40 cubic feet capacity. It is best for those installing on vehicles without existing roof racks.
Specifications side by side
| Spec | Mockins 40 cu ft XXL Roof Bag | Sailnovo 21 cu ft Soft Roof Bag | MCBD 40 cu ft Soft-Shell Roof Bag | RoofPax 19 cu ft Polyester Roof Bag | Asinking 20 cu ft Waterproof Roof Bag | Mockins 40 cu ft XXL Soft-Shell Roof Bag | BagMate 23 cu ft Roof Bag – 840D PVC |
|---|---|---|---|---|---|---|---|
| Capacity | 40 cu ft | 21 cubic feet | 40 cu ft | 19 Cubic feet | 20 cu ft | 40 cu ft | 23 cu ft |
| Shell Type | 840D vinyl | Soft Shell | soft-shell, 900D PVC tarpaulin | polyester | 900D PVC tarpaulin | Soft-shell | 840D PVC |
| Water Resistance | waterproof | Waterproof | 100% waterproof | 100% waterproof | 100% waterproof | Waterproof | 100% waterproof |
| Security | not specified | not specified | combination lock | not specified | Lock | not specified | not specified |
| Installation | not specified | Tie-Down Strap | not specified | door hook straps, 10 straps | Metal ring strap design | not specified | not specified |
| Vehicle Compatibility | not specified | not specified | not specified | fits cars with or without roof rack | With or without roof rack | not specified | not specified |
| Dimensions | 72 x 48 x 20 in | 9.84 x 7.09 x 13.8 in | 72 x 48 x 20 in | 47.2 x 35.4 x 19.8 in | 52 x 40 x 12-18.5 in | 72 x 48 x 20 in | 55" L x 44.9" W x 19.5" H |
| Recommended Use | not specified | not specified | not specified | not specified | not specified | Suitcases, sleeping bags | not specified |
| Vehicle Type | Car | Car | Car, SUV | Car | Car | Car | Car, SUV |
| Size | 40 Cubic Feet | 21 Cubic Feet | 40 Cubic Feet | 19 Cubic feet | 20 Cubic Feet | 40 Cubic Feet | XXL 23 Cu. Ft. |
| Mount Type | not specified | Roof Mount | Roof Mount | Roof Mount | Roof Mount | not specified | Roof Mount |
| Lockable | not specified | not specified | not specified | not specified | Lockable | not specified | not specified |
| Includes Bag | not specified | not specified | With Bag | not specified | not specified | not specified | not specified |
| Weight | 16.5 pounds | 8.16 pounds | 16.3 pounds | 12.4 pounds | not specified | 15.7 pounds | 13.1 pounds |
| Color | Black | Black | Blue | ['Black', 'Orange', 'Grey'] | Black with Blue | Black/Orange | Black |
| Model | MA-RB-40BLK-72X48X20-89 | Sailnovo5033-FR | 40cf | Rooftop_Cargo_Carrier | rooftop cargo bag | MA-RB-40BLK-89-V2 | RBM-CRB |
If you also evaluate vehicles for children, compare weight capacities and dimensions across fitnessclub ride on cars alternatives.
Frequently asked questions
Which roof bag has the largest capacity without racks?
The Mockins 40 cu ft XXL Roof Bag offers the maximum storage volume in this list. It provides 40 cubic feet of space with a 72 x 48 x 20 inch footprint. This soft-shell design secures directly to vehicles lacking roof racks. It suits buyers who prioritize high capacity and waterproof durability over a sleek profile.
What is the lightest soft roof bag available?
The Sailnovo 21 cu ft Soft Roof Bag is the lightest option at 8.16 pounds. It offers 21 cubic feet of storage in a compact 9.84 x 7.09 x 13.8 inch size. This low weight makes it easy to handle and store when not in use. It is ideal for cars without roof rails needing compact solutions.
Which bag fits best on wide roofs?
The MCBD 40 cu ft Soft-Shell Roof Bag is designed for wide roofs needing large volume. It provides 40 cubic feet of storage in a 48-inch width. The soft-shell construction adapts to various vehicle shapes. It works best for travelers who need ample, waterproof storage without requiring rigid structural support from existing roof racks.
Is there a lockable roof bag option?
Yes, the Asinking 20 cu ft Waterproof Roof Bag is lockable. It features a 52 x 40 x 18.5 inch footprint for secure storage on smaller vehicles. This feature adds an extra layer of security for your gear. It is a practical choice for drivers who prioritize waterproofing and easy installation over maximum capacity.
Which bag is best for sedans and small SUVs?
The RoofPax 19 cu ft Polyester Roof Bag is best for sedans and small SUVs. It has a compact 47.2 x 35.4 x 19.8 inch size that fits tighter spaces. Weighing 12.4 pounds, it offers a secure, weather-ready option. Drivers who prioritize a tight fit and moderate cargo space will find this model suitable.
What is the best option for moderate storage needs?
The BagMate 23 cu ft Roof Bag fits drivers needing reliable storage without maximum capacity. It offers 23 cubic feet in a 55 x 44.9 x 19.5 inch footprint. This size is ideal for vehicles without existing roof racks. It provides a balanced solution for those who do not require the largest available volume.