SportRack Cargo Box + Go Alternatives: 6 Similar Picks Compared

How alternatives compare to SportRack

Sailnovo 21 cu ft Soft Roof Bag

The Sailnovo 21 cu ft Soft Roof Bag offers a fixed 21 cubic foot capacity, which is significantly larger than the flexible, foldable volume of the SportRack Cargo Box + Go. It weighs 8.16 pounds, making it lightweight but rigid in its bag form. Unlike the SportRack’s zipper closure, this model relies on straps and hooks for security. It is designed for cars without roof rails, using door hooks for mounting. This makes it a better choice if you need a dedicated, waterproof storage solution rather than a stowable accessory. The black color matches the SportRack, but the lack of locking features means it is less secure for long-term parking.

Mockins 40 cu ft XXL Soft-Shell Roof Bag

The Mockins 40 cu ft XXL Soft-Shell Roof Bag provides double the storage capacity of most soft bags, offering 40 cubic feet of space. It measures 72 inches long and weighs 15.7 pounds. This is much heavier and bulkier than the SportRack Cargo Box + Go, which is designed for easy folding and compact storage. The Mockins model is fixed in shape when mounted, whereas the SportRack can be folded flat. It is ideal for shoppers needing maximum soft-shell cargo space for large items. If you prioritize volume over portability and do not mind the extra weight, this larger bag is the superior option for high-volume loads.

Mockins 40 cu ft XXL Roof Bag

This Mockins 40 cu ft XXL Roof Bag matches the largest capacity on the list at 40 cubic feet. It weighs 16.5 pounds and features a black color scheme similar to the SportRack. Unlike the SportRack’s portable, zippered design, this is a fixed soft-shell bag that mounts via straps. It is waterproof and versatile for vehicles with or without crossbars. The SportRack is better for occasional trips where you want to store the box away when not in use. Choose this Mockins alternative if you need a permanent, high-capacity waterproof solution and do not require the foldable convenience of the original product.

Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag

The Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag offers 30 cubic feet of capacity, which is more than the typical utility of the SportRack Cargo Box + Go. It weighs 12.4 pounds and measures 60 inches long. This model is designed for rackless vehicles, using door hooks and straps for installation. The SportRack is a soft shell but is intended to be stored when not in use. This Mockins bag is a strong choice for large loads on vehicles without roof racks. It provides weather-sealed storage but lacks the compact, foldable nature of the SportRack, making it less convenient for frequent removal and storage.

Mockins 30 cu ft Soft-Shell Vinyl Roof Bag

The Mockins 30 cu ft Soft-Shell Vinyl Roof Bag provides 30 cubic feet of capacity and weighs 15.5 pounds. It includes a combination lock, adding a security feature not explicitly detailed in the SportRack’s data. This model is designed for rackless vehicle setups, using an installation kit with door hooks. The SportRack is a polypropylene soft shell with a zipper, suitable for various vehicles. The Mockins alternative is better if you need waterproof storage on a car without crossbars and want added security. It is heavier and less portable than the SportRack, which folds for easy stowage.

Rooftop Ranger 21 cu ft Soft Shell Cargo Carrier

The Rooftop Ranger 21 cu ft Soft Shell Cargo Carrier offers 21 cubic feet of capacity and weighs 8.5 pounds. It is slightly heavier than the Sailnovo but lighter than the larger Mockins bags. This model is designed for vehicles without roof racks, using door hooks and straps. The SportRack Cargo Box + Go is a polypropylene soft shell with a zipper, focusing on portability. The Rooftop Ranger is a better choice if you need a dedicated, waterproof bag for rackless cars. It lacks the foldable convenience of the SportRack, which can be stored away when not in use, making it less versatile for occasional use.

Quick picks

Our 7 picks

1 Best overall

SportRack Cargo Box + Go Packs

Best for: lightweight, foldable cargo storage for occasional trips

Shell Type

Soft Shell

View on Amazon: SportRack Cargo Box + Go Packs

The SportRack Cargo Box + Go is a soft-shell roof cargo carrier in black. It uses a polypropylene (PP) construction and a zipper closure. This model is a lightweight, flexible alternative to hard-shell boxes. It suits drivers who want an easy-to-store cargo solution for occasional trips without the bulk of a rigid box.

Pros

• Soft-shell design is lightweight and easy to store when not in use
• Polypropylene (PP) material offers good weather resistance
• Zipper closure provides secure access to your gear

Cons

• Soft shell offers less protection against impacts than a hard shell
• No internal frame or support structure listed, so shape may sag when not fully packed

Good fit if

• You want a cargo carrier that folds flat for storage between trips
• You prioritize low weight and easy handling over rigid security

Skip if

• You need a hard-shell box for maximum protection of valuables
• You plan to carry heavy or sharp items that could stress the soft material

Verdict: SportRack Cargo Box + Go Soft Shell is a practical soft-shell option for occasional use, offering easy storage and lightweight handling, but it lacks the durability and security of a hard-shell box.

2 Best premium

Sailnovo 21 cu ft Soft Roof Bag

Best for: budget-friendly waterproof roof bag for cars without rails

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

View on Amazon: Sailnovo 21 cu ft Soft Roof Bag

The Sailnovo 21 cu ft soft shell roof bag is a waterproof cargo carrier for cars without a luggage rack. It measures 9.84 x 7.09 x 13.8 inches and weighs 8.16 pounds. It installs with tie-down straps. This bag is suited for drivers who need a simple, temporary cargo solution for occasional trips.

Pros

• Waterproof construction protects gear from rain
• Lightweight at 8.16 pounds for easy handling
• Available in two sizes: 21 and 15 cubic feet

Cons

• Soft shell offers less security than a hard shell
• No anti-theft lock or zipper lock listed

Good fit if

• You need a waterproof cargo bag for a car without roof rails
• You want a lightweight, stowable carrier for occasional use

Skip if

• You prefer a hard shell for better security and aerodynamics
• You need a carrier with a larger capacity than 21 cubic feet

Verdict: Sailnovo 21 cu ft Soft Shell Roof Bag is a practical waterproof soft shell option for cars without roof rails, but its small capacity and lack of locking features limit its appeal for frequent or high-volume use.

3 Best budget

Mockins 40 cu ft XXL Soft-Shell Roof Bag

Best for: budget shoppers needing maximum soft-shell cargo space

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

View on Amazon: Mockins 40 cu ft XXL Soft-Shell Roof Bag

The Mockins 40 CuFt XXL Soft-Shell Roof Bag is a soft-shell cargo carrier that gives you 40 cubic feet of storage space, measuring 72 by 48 by 20 inches. It is designed to fit vehicles with or without crossbars, side rails, and roof racks. This carrier is suited for you if you need a large, waterproof bag for trips or moving, and it comes with a complete installation kit including straps, hooks, a roof mat, and a lock.

Pros

• 40 cu ft capacity is the largest on this list
• Waterproof construction with abrasion-resistant vinyl and sealed zippers
• Works on vehicles with or without roof racks
• Includes a full accessory kit: straps, hooks, mat, lock, and carry bag
• Backed by a 10-year limited warranty

Cons

• Soft-shell design offers less security than a hard-shell box
• No side-opening access; you must unload from the rear or top
• Assembly of multiple straps and hooks required for installation

Good fit if

• You need maximum cargo volume at the lowest cost
• You want a waterproof carrier that fits any vehicle, even without roof bars
• You prefer a complete kit with all accessories included

Skip if

• You want a hard-shell box for better security and aerodynamics
• You need quick, tool-free installation without strap adjustments
• You plan to carry items that must stay completely dry in heavy rain

Verdict: Mockins 40 CuFt XXL Soft-Shell Roof Bag is a practical choice if you want the largest soft-shell capacity on this list and a full accessory kit, all at a budget-friendly price point.

4 Also great

Mockins 40 cu ft XXL Roof Bag

Best for: drivers needing a large, waterproof soft-shell bag for vehicles without crossbars

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

View on Amazon: Mockins 40 cu ft XXL Roof Bag

The Mockins 40 CuFt XXL is a soft-shell roof bag with 40 cubic feet of cargo space. It measures 72 x 48 x 20 inches and is made from waterproof 840D vinyl. This bag works with or without crossbars, using multiple strap configurations. It is a practical choice for large loads and vehicles without a roof rack.

Pros

• Large 40 cu ft capacity for bulky gear
• Waterproof 840D vinyl shell with sealed seams and zipper flap
• Includes door hooks, trunk hooks, ratchet straps, and a roof mat
• Fits vehicles with or without crossbars or roof racks
• Comes with a carry bag for storage and a combo lock

Cons

• Soft-shell design offers less security than a hard-shell box
• No integrated locking mechanism on the zippers (combo lock included but separate)
• Setup requires routing straps through doors or trunk, which may take time

Good fit if

• You need a large, waterproof cargo bag for road trips or moving
• Your vehicle lacks crossbars and you want a no-rack solution
• You prefer a collapsible carrier that stores in a carry bag when not in use

Skip if

• You want a hard-shell roof box for better security and aerodynamics
• You need a carrier that installs quickly without routing straps through the car
• You prefer a smaller, more compact cargo bag for lighter loads

Verdict: Mockins 40 CuFt XXL Soft-Shell Roof Bag is a spacious, waterproof soft-shell cargo bag that fits vehicles with or without crossbars, making it a versatile alternative for large loads.

5 Also great

Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag

Best for: Large soft-shell loads on rackless vehicles

Capacity

30 cubic ft

Dimensions

60"x43"x20"

Shell Type

Soft Shell

Mount Type

Roof Mount

Weight

12.4 pounds

View on Amazon: Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag

The Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag is a soft-shell rooftop carrier for vehicles with crossbars, side rails, or a bare roof. It offers 30 cubic feet of capacity in a 60x43x20-inch footprint. The bag is built from abrasion-resistant 840D vinyl with welded seams and a waterproof zipper. It includes door hooks, heavy-duty straps, and an anti-slip mat for secure mounting. It suits travelers who need flexible, weather-protected storage.

Pros

• 30 cubic ft capacity holds 6-8 large suitcases
• 840D vinyl with welded seams and waterproof zipper
• Door hook system works on vehicles without roof rails
• Anti-slip mat helps protect paint and reduce load shifting
• Includes a 10-year limited warranty

Cons

• Soft shell design does not offer the locked security of a hard shell
• Door hook mounting may limit fit on some vehicle styles
• 20-inch height adds noticeable stack above the roofline

Good fit if

• You want a large soft-shell carrier for family trips
• You need a roof bag that works without crossbars or side rails
• You want weather protection from a waterproof zipper and welded seams

Skip if

• You prefer a hard-shell cargo box with locking capability
• You want a lower-profile bag to minimize roof height
• You are unsure whether door hooks will fit your vehicle

Verdict: Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag is a roomy, weather-sealed soft carrier that mounts with door hooks and straps, making it a strong choice for rackless vehicles.

6 Best suv

Mockins 30 cu ft Soft-Shell Vinyl Roof Bag

Best for: rackless vehicle setups needing waterproof storage

Capacity

30 cu ft

Shell Type

soft-shell vinyl

Water Resistance

waterproof

Security

combination lock

Vehicle Compatibility

vehicles with or without roof rack

Dimensions

60 x 43 x 20 in

View on Amazon: Mockins 30 cu ft Soft-Shell Vinyl Roof Bag

This is a 30 cu ft soft-shell vinyl roof cargo bag from Mockins. It measures 60 x 43 x 20 inches and is waterproof with a combination lock for security. It fits vehicles with or without a roof rack, making it a versatile option for anyone needing extra cargo space on top of their car, SUV, or truck.

Pros

• Waterproof vinyl shell with welded seams and a protected zipper
• Includes a combination lock for security
• Comes with a protective roof mat, door hooks, and straps for rackless installation
• Folds into its own carry case for storage

Cons

• Soft-shell design offers less protection for contents than a hard shell
• No remote or keyless lock mechanism listed
• Requires assembly of multiple straps and hooks for installation

Good fit if

• You want a waterproof soft-shell cargo bag that works on vehicles without a roof rack
• You need a combination lock for securing your gear
• You prefer a bag that folds into a carry case when not in use

Skip if

• You want a hard-shell roof box for maximum security and aerodynamics
• You need a larger capacity than 30 cubic feet

Verdict: Mockins 30 cu ft Soft-Shell Vinyl Roof Bag is a practical waterproof cargo bag with a combination lock and rackless installation kit, making it a solid choice for flexible roof storage.

7 Also great

Rooftop Ranger 21 cu ft Soft Shell Cargo Carrier

Best for: vehicles without roof racks

Capacity

21 cu ft

Shell Type

Soft shell

Water Resistance

100% waterproof

Security

Security lock

Installation

Door hooks and straps

Vehicle Compatibility

With or without roof racks

View on Amazon: Rooftop Ranger 21 cu ft Soft Shell Cargo Carrier

This soft-shell carrier offers 21 cubic feet of storage in a 54x42x17 inch footprint. It weighs 8.5 pounds and uses door hooks and straps for installation. The design works with or without roof racks. It features 100% waterproof construction and includes a security lock. This option suits drivers needing extra space without permanent roof fixtures.

Pros

• 21 cubic feet capacity
• 100% waterproof material
• Universal door hook installation
• Includes security lock
• Lightweight at 8.5 pounds

Cons

• Smaller 21 cu ft capacity
• Soft shell offers less protection
• Manual strap installation required

Good fit if

• You need extra cargo space
• You lack roof racks
• You want waterproof storage

Skip if

• You prefer hard shell durability
• You need over 21 cu ft
• You want rack-mounted security

Verdict: Rooftop Ranger 21 CuFt Soft Shell Carrier fits drivers who need flexible, waterproof storage on vehicles without roof racks. It provides solid capacity for weekend trips but lacks the rigidity of hard cases.

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