Best 20 Cubic Feet Roof Cargo Boxes: 5 Spec-Based Picks

Quick picks

The best fit for you

• You need waterproof storage on a bare roof Asinking 20 cu ft Waterproof Roof Bag This roof bag offers 20 cubic feet of lockable, waterproof capacity without requiring installed racks.
• You haul heavy loads on a large SUV HubPax 20 cu ft Roof Basket & Bag Its 65-inch length and basket design provide high capacity and stability for bulky sports equipment.
• You want a budget option for a car Kingfun 20 cu ft Roof Bag This soft roof bag provides 20 cubic feet of flexible, waterproof storage without permanent installation.

Our 5 picks

1 Best overall

Asinking 20 cu ft Waterproof Roof Bag

Best for: waterproof storage on vehicles without racks

Size

20 Cubic Feet (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

View on Amazon: Asinking 20 cu ft Waterproof Roof Bag Affiliate link

This Asinking roof bag offers 20 cubic feet of storage without requiring a roof rack. It uses 900D PVC tarpaulin and triple-reinforced seams for 100% waterproofing. The metal ring strap design allows easy installation on any vehicle. You get a lockable, soft-shell carrier that fits cars with or without cross bars. It is a practical option for those needing flexible, high-capacity storage.

Pros

• 20 cubic feet capacity
• 100% waterproof 900D PVC tarpaulin
• Lockable for security
• Fits vehicles with or without roof racks
• Metal ring strap design for easy installation

Cons

• Soft shell offers less aerodynamic efficiency than hard boxes
• No internal organization pockets listed
• Manual installation required without automated features

Good fit if

• You need 20 cubic feet of storage space
• You want a waterproof carrier that fits any car
• You prefer a soft shell over a hard box

Skip if

• You require a rigid shell for better aerodynamics
• You need a carrier that installs without straps
• You prefer a hard box for maximum security

Verdict: Asinking 20 Cu Ft Waterproof Roof Bag is a versatile, waterproof storage solution for drivers without roof racks. It suits those prioritizing capacity and weather protection over aerodynamic efficiency.

2 Best premium

HubPax 20 cu ft Roof Basket & Bag

Best for: heavy loads on large SUVs or trucks

Size

20 Cubic Feet (what this guide is about)

Capacity

20 cu ft

Shell Type

Soft shell

Load Capacity

200 lbs

Water Resistance

Waterproof

Installation

4 sets of U-bolts

View on Amazon: HubPax 20 cu ft Roof Basket & Bag Affiliate link

This HubPax set combines a hard roof basket with a 20 cubic foot soft shell waterproof bag. The basket measures 65 inches long and supports up to 200 lbs. It uses U-bolt mounting for secure attachment to crossbars. The included bag protects cargo from rain and dust. This dual system suits drivers needing extra volume for large SUVs or trucks.

Pros

• 200 lbs load capacity for heavy gear
• Includes 20 cu ft waterproof soft shell bag
• Basket dimensions of 65 x 39 x 6 inches
• Secure U-bolt mounting system

Cons

• Basket height is only 6 inches, limiting bulkier items
• Requires separate purchase of roof crossbars
• Soft shell bag adds wind noise at highway speeds

Good fit if

• You need to carry heavy loads up to 200 lbs
• You want to protect gear from rain with the included bag
• You have a large SUV or truck with crossbars

Skip if

• You only have bare roof rails without crossbars
• You need a rigid hard shell for maximum security
• You prefer a single integrated unit without a separate bag

Verdict: HubPax 20 Cu Ft Roof Basket & Bag offers high capacity and weather protection for large vehicles, making it ideal for families transporting bulky sports equipment.

3 Also great

Kingfun 20 cu ft Roof Bag

Best for: Bare roof vehicles without racks

Size

20 Cubic Feet (what this guide is about)

Capacity

20 cu ft

Shell Type

Soft-shell

Water Resistance

Waterproof

Security

Locks

Installation

Straps and door hooks

View on Amazon: Kingfun 20 cu ft Roof Bag Affiliate link

The Kingfun 20 cubic foot roof bag is a soft-shell cargo carrier designed for vehicles with or without existing roof racks. It uses heavy-duty straps and door hooks for installation. The triple-strength waterproof material and covered zipper protect gear from rain and snow. The integrated anti-slip mat helps keep the bag stable at highway speeds. It folds compactly for storage when not in use.

Pros

• 20 cubic feet capacity
• Triple-strength waterproof material
• Fits bare roofs with door hooks
• Integrated anti-slip mat
• Folds for compact storage

Cons

• Soft shell lacks rigid structure
• No included hard mounting hardware
• Manual strap tensioning required

Good fit if

• You need a bag for a bare roof
• You want to avoid rack installation
• You need extra interior space

Skip if

• You prefer a hard-shell box
• You want rigid aerodynamic shape
• You need built-in locking mechanisms

Verdict: Kingfun 20 Cu Ft Soft Roof Bag is a flexible solution for drivers who need to carry gear without installing a permanent rack system. It suits those who prioritize waterproof protection and easy storage over rigid cargo space.

4 Also great

Sailnovo 20 cu ft Roof Bag

Best for: vehicles without roof bars

Size

20 Cubic Feet (what this guide is about)

Capacity

20 cu ft / 580L

Shell Type

1000D waterproof PVC

Water Resistance

Waterproof

Installation

Straps, door hooks, non-slip mat

Vehicle Compatibility

With or without roof bars

View on Amazon: Sailnovo 20 cu ft Roof Bag Affiliate link

This Sailnovo roof bag offers 20 cubic feet of storage in a soft shell design. It measures 51 by 39 by 17 inches and weighs 8.93 pounds. The 1000D waterproof PVC construction includes a rain curtain for weather protection. It secures with straps and door hooks, fitting vehicles with or without roof bars. The aerodynamic shape helps reduce wind noise. It suits families needing extra space for trips.

Pros

• 20 cubic feet capacity holds luggage for 5-8 people
• 1000D waterproof PVC shell with 13cm rain curtain
• Fits vehicles with or without roof bars
• Aerodynamic design reduces wind resistance
• Includes non-slip mat with reflective strip

Cons

• Soft shell lacks rigid structural protection
• Requires manual strap tightening and hooking
• No integrated locking mechanism mentioned

Good fit if

• You need flexible storage that folds flat
• You drive a car without roof rails
• You want a lightweight carrier under 10 pounds

Skip if

• You require a hard shell for heavy items
• You prefer a keyed lock system
• You need a carrier over 20 cubic feet

Verdict: Sailnovo 20 Cu Ft Roof Bag provides ample volume for families without roof bars. It is a practical solution for travelers who need flexible, weather-resistant storage that installs quickly on bare roofs or crossbars.

5 Best budget

MeeFar 20 cu ft Soft Shell Roof Bag

Best for: Travelers without roof racks needing waterproof storage

Size

20 Cubic Feet (what this guide is about)

Capacity

20 cubic feet

Shell Type

Soft shell

Water Resistance

100% waterproof

Security

Combination lock

Installation

Quick and easy installation in minutes

View on Amazon: MeeFar 20 cu ft Soft Shell Roof Bag Affiliate link

The MeeFar 20 Cu.ft. roof bag offers 20 cubic feet of storage in a soft shell design. It measures 51 x 40 x 17 inches and uses 700D PVC tarpaulin for 100% waterproof protection. You can install it in minutes with six security hooks and an anti-slip mat. It fits cars with or without a roof rack. The included combination lock secures the zippers. This bag suits travelers needing flexible, weather-resistant cargo space.

Pros

• 100% waterproof 700D PVC tarpaulin construction
• Fits vehicles with or without roof racks
• Includes combination lock for zipper security
• Folds into a storage bag for compact packing

Cons

• Soft shell offers less aerodynamic efficiency than hard cases
• No dedicated side pockets for small items
• Requires manual locking of zippers

Good fit if

• You need extra storage for a family road trip
• You want to avoid buying a roof rack
• You need a bag that folds flat for storage

Skip if

• You prefer a rigid, hard-shell design
• You need maximum aerodynamic fuel efficiency
• You want integrated keyless entry locks

Verdict: MeeFar 20 Cu.ft Soft Shell Roof Bag provides reliable, waterproof storage for drivers without existing racks. It is a practical solution for families carrying luggage or gear who value flexibility over aerodynamic performance.

Specifications side by side

Is 20 Cubic Feet Worth It for Your Vehicle?

Twenty cubic feet offers a middle ground for most drivers. It holds enough gear for a weekend trip without overwhelming a standard sedan. The Asinking bag measures 52 inches long and 40 inches wide, fitting many car roofs. Larger options like the HubPax basket extend to 65 inches, better suited for SUVs or trucks. If you carry bulky items like sports equipment, this volume provides necessary space. For light luggage, it may be excessive.

Worth it if

• You need waterproof storage for a weekend family trip
• You drive a large SUV or truck with a wide roof
• You carry bulky sports equipment that requires extra length

Skip it if

• You only carry a few small bags for light travel
• Your vehicle has a narrow roof that cannot support 40-inch widths
• You prioritize aerodynamic efficiency over maximum cargo capacity

How we picked 20 cu ft picks

We identified these products by scanning Amazon listings for the specific feature of 20 cubic feet. This size is noted in the title or feature list of each item. We only selected one size or variant from each product family to keep the list clear and focused on your capacity needs. All details come directly from the published specifications on the listings. We do not handle or test these items physically. The information is strictly based on what the manufacturers state. This ensures you get accurate data for your comparison. We rely on the listing text to verify the volume capacity. This method keeps the guide factual and spec-based. We avoid personal experience or unverified claims. This approach helps you find the right fit for your vehicle.

How to choose the right 20 cu ft carrier

1. Check vehicle roof type

   You must match the mount type to your vehicle. The Asinking and Kingfun bags are designed for bare roofs without installed racks. They use straps to secure the load directly to the roof surface. The HubPax basket requires a different setup, often involving crossbars or specific anchor points. If you have existing roof rails, a basket may offer better stability. If your car has a smooth, bare roof, a soft bag is the only viable option. Always verify your vehicle has adequate clearance before strapping anything to the top.

2. Measure roof length carefully

   All five options hold 20 cubic feet, but their physical dimensions differ significantly. The HubPax basket extends to 65 inches in length. The Asinking bag is 52 inches long. You need to measure your roof from side to side and front to back. A 65-inch basket may overhang a sedan roof, creating wind noise or safety hazards. The 52-inch Asinking model fits more standard car roofs. Ensure the carrier does not block your rear view or exceed your vehicle width by more than a few inches for safe driving.

3. Consider shell material needs

   You have a choice between rigid baskets and soft shells. The HubPax features a rigid basket structure, which can protect gear from shifting during sharp turns. The MeeFar and Kingfun options use soft shell designs. Soft shells conform to your load shape, which can improve aerodynamics slightly. However, they offer less structural protection than a hard basket. If you carry fragile items, a rigid basket might be safer. If you prioritize easy storage when not in use, a soft bag folds down smaller. Choose based on how you pack your gear.

4. Verify water resistance

   Weather protection is critical for roof storage. The Asinking bag is explicitly described as waterproof. The Kingfun and MeeFar options also emphasize waterproof features. The HubPax includes a bag, which likely adds a layer of protection to the basket. You should check if the product description mentions sealed seams or water-resistant materials. Even with waterproof claims, you may want to use a liner for extra security. Rain can seep into gaps if straps are not tightened correctly. Ensure the material suits your local climate and typical weather conditions during travel.

5. Check security features

   You need to know if the carrier can be locked. The Asinking bag is listed as lockable, which helps prevent theft. Other products may not mention locking mechanisms in their specs. If you leave gear unattended in public areas, a lockable option is essential. Some bags allow you to insert a standard padlock through the strap loops. Others may have integrated lock points. If security is a high priority, verify the locking method before purchase. A non-lockable bag offers less peace of mind for expensive luggage or equipment.

Frequently asked questions

See also

• best roof cargo boxes under 150
• best roof cargo boxes under 300
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