The largest listed rooftop storage option is the RoofPax 28-cubic-foot cargo bag, while the largest hard-shell box in this selection is the Relaxcabine 26-cubic-foot model. Choose a soft carrier for flexible mounting options or a hard box for rigid protection and structure. The SportRack Vista XL is a rear-opening option with 18 cubic feet, and the Thule Pulse 2 L offers 16 cubic feet with access from both sides.
| Product | Type | Listed Capacity | Best For |
|---|---|---|---|
| RoofPax XXL | Soft cargo bag | 28 cu. ft. | Maximum listed storage |
| Relaxcabine Extra Large | Hard-shell box | 26 cu. ft. | Largest listed rigid box |
| SportRack Vista XL | Hard-shell box | 18 cu. ft. | Rear access away from traffic |
| Thule Pulse 2 L | Hard-shell box | 16 cu. ft. | Two-sided access |
| GarveeTech Cargo Box | Hard-shell box | 12 cu. ft. | Buyers prioritizing listed load capacity |
RoofPax XXL 28-Cubic-Foot Cargo Carrier
The RoofPax XXL is the largest option by stated volume in this selection, with 28 cubic feet of storage. It is a soft cargo bag rather than a rigid roof box, so it suits buyers who prioritize capacity and flexible mounting over a hard shell.
- Includes four door-hook straps and ten heavy-duty tie-down straps.
- Designed for vehicles with or without roof racks, raised side rails, or crossbars.
- Uses dual zippers, double seams, a water-repellent coating, and strap restraints for weather protection.
Best for: Travelers seeking maximum listed cargo volume and multiple mounting options. Limitation: It is not a hard-shell box; follow the seller’s fit guidance and secure the bag as directed.
Relaxcabine 26-Cubic-Foot Hard-Shell Box
This Relaxcabine model is the largest listed rigid cargo box, with 26 cubic feet of capacity and a stated maximum load of 150 pounds. Its ABS+PC composite shell is described as impact-resistant and designed to shield cargo from rain, snow, dust, and UV exposure.
- Tool-free assembly system.
- Mounting brackets are described as fitting most factory and aftermarket round, square, and aerodynamic roof bars.
- Dual-side opening provides access from either side of the vehicle.
Best for: Buyers who want near-maximum listed capacity in a hard-shell format. Limitation: “Most” roof racks does not mean every rack; verify bar and vehicle fit before purchase, and check the vehicle’s roof-load limits.
SportRack Vista XL Rear-Opening Box
The SportRack Vista XL provides 18 cubic feet of internal cargo capacity in a durable, UV-resistant ABS shell. Its rear-opening design allows access from the back of the vehicle, which can be useful when roadside traffic makes opening a box from the side less convenient.
Best for: Buyers who want a hard-shell carrier with rear access and substantial space for travel gear. The rear-opening layout is its main distinction among these choices. Limitation: Its stated capacity is smaller than the 26-cubic-foot hard box and 28-cubic-foot soft carrier above.
Thule Pulse 2 L Dual-Side Box
The Thule Pulse 2 L holds 450 liters, or about 16 cubic feet, and has a listed load capacity of 75 kilograms. Its dual-side opening makes loading and unloading possible from either side. The tool-free mounting system includes a torque indicator that clicks when attached safely, and the product description says the closure is confirmed.
Best for: Commuters and weekend travelers who value convenient two-sided access and a guided mounting system. Limitation: Its capacity is lower than the largest boxes in this roundup, so compare volume and load needs before choosing it.
GarveeTech 12-Cubic-Foot Cargo Box
The GarveeTech box offers 12 cubic feet of storage in a hard-shell ABS design. Its listed dimensions are 54.3 by 31.5 by 13.4 inches, and its maximum capacity is 165 pounds. The product description specifies roof-rack installation and says the shell is waterproof and UV-resistant.
Best for: Buyers for whom the stated load capacity and compact dimensions matter more than maximum volume. Limitation: At 12 cubic feet, it has the smallest listed storage capacity here, and it requires a roof rack.
Buying Guide: How To Choose A Large Roof Cargo Box
Do you need the largest capacity or a hard shell?
Compare both volume and construction. The RoofPax bag has the largest stated capacity at 28 cubic feet, but it is soft-sided. The Relaxcabine is the largest listed hard-shell option at 26 cubic feet. A rigid box provides a structured enclosure; a bag may suit buyers who need flexible mounting. Product descriptions alone do not establish which format is best for every trip.
Will the carrier fit your vehicle?
Check the carrier’s mounting requirements, your roof-rack configuration, and available roof space. Confirm that the box will not interfere with opening the hatch or other vehicle features. Verify the vehicle manufacturer’s roof-load limit, accounting for the carrier’s weight as well as its contents. The RoofPax is described for vehicles with or without racks, while the GarveeTech requires a roof rack.
How much weight can you carry?
Capacity in cubic feet measures space, not allowable load. The listed limits vary: 75 kilograms for the Thule, 150 pounds for the Relaxcabine, and 165 pounds for the GarveeTech. Do not assume an unlisted weight limit for another product. Follow both the cargo carrier’s instructions and the vehicle’s roof-load limit.
Which opening style is more convenient?
A rear-opening box, such as the SportRack, can provide access from behind the vehicle. Dual-side-opening models, including the Thule and Relaxcabine, allow access from either side. Consider where you usually park and load gear, as well as nearby traffic or obstacles.
Frequently Asked Questions
What is the largest rooftop storage option listed?
The RoofPax XXL cargo bag has the largest stated volume at 28 cubic feet. It is a soft carrier, not a hard-shell box.
What is the largest hard-shell roof box in this selection?
The Relaxcabine hard-shell box is listed at 26 cubic feet, making it the largest rigid box among these products.
Does a larger cubic-foot capacity mean a higher weight limit?
No. Cubic feet describe storage volume, while a load limit describes weight. Check both specifications and the vehicle’s roof-load limit.
Can a roof cargo box fit any vehicle?
No. Fit depends on the carrier’s mounting system, the vehicle’s roof rack or mounting points, and available roof space. Verify compatibility before buying.
Is a soft cargo bag the same as a hard-shell box?
No. A soft bag is flexible and may offer different mounting options, while a hard-shell box has a rigid structure. The RoofPax in this list is a bag; the other four products are hard-shell boxes.