The best large car roof box depends on how much gear you need to carry and whether you prefer a rigid shell or a flexible carrier. The Relaxcabine is best for shoppers seeking maximum listed volume, while the Thule Pulse 2 M offers 14 cubic feet and dual-side access. The iBirdie is a soft-sided alternative, and the PM PERFORMOTOR and GARVEETECH are hard-shell options with listed capacities of 13 and 12 cubic feet.
| Product | Type | Listed storage | Best for |
|---|---|---|---|
| Relaxcabine | Hard shell | 26 cu. ft. | Maximum stated volume |
| Thule Pulse 2 M | Hard shell | 14 cu. ft. / 400 L | Dual-side access and tool-free attachment |
| iBirdie | Soft-sided | 15.3 cu. ft. | Flexible vehicle fit |
| PM PERFORMOTOR | Hard shell | 13 cu. ft. | Bulky gear and weather protection |
| GARVEETECH | Hard shell | 12 cu. ft. | Dual-side access and a stated 165-pound capacity |
Relaxcabine 26-Cubic-Foot Roof Box
This hard-shell carrier is best for buyers prioritizing the largest stated storage volume among these picks. Its 26 cubic feet of space and 150-pound load capacity are intended to accommodate luggage, camping gear, and sports equipment. The ABS and PC composite construction is described as impact-resistant and weather-protective.
The product listing says its tool-free mounting system is designed for most factory and aftermarket roof racks, including round, square, and aerodynamic bars. Confirm the box and vehicle roof-rack requirements before buying. Its large capacity does not mean every vehicle can safely carry a fully loaded box; check the vehicle’s roof-load limit.
Thule Pulse 2 M Roof-Mounted Box
The Thule Pulse 2 M is best for drivers who want a rigid box with access from either side of the vehicle. It provides 400 liters, or about 14 cubic feet, of cargo space and has a listed 75-kilogram load capacity. The product information describes it as suitable for luggage, gear, skis, and snowboards.
Its tool-free attachment system includes a torque indicator that clicks when the box is safely attached, and the listing also notes a closure confirmation. These features may help simplify setup and checking, but users should still follow the manufacturer’s instructions. Choose another option if a higher stated weight limit or more storage volume is the priority.
iBirdie 15.3-Cubic-Foot Cargo Carrier
This soft-sided carrier is best for shoppers who value flexible fit and need an alternative to a rigid roof box. Its listed dimensions are 46 by 34 by 17 inches, with 15.3 cubic feet of storage. The 1200D Oxford fabric and PVC construction is described as waterproof and intended to protect contents from rain, snow, and dust.
The listing says it can be used with or without roof racks and includes extra door hooks. That differs from the hard-shell boxes here, which require crossbars or a roof rack. Soft-sided construction may not provide the same rigid protection as a hard shell, so consider what you plan to carry and how you will secure the carrier.
PM PERFORMOTOR 13-Cubic-Foot Roof Box
The PM PERFORMOTOR is best for buyers who want a hard shell with 13 cubic feet of storage and a listed 110-pound maximum load. It measures 56.3 by 36.8 by 16.25 inches, and the product description says its 14-inch opening can accommodate bulky items such as suitcases, camping gear, or skis.
Its ABS plastic shell is described as impact-resistant and weather- and UV-resistant. The box is designed for vehicles with factory or aftermarket crossbars and includes mounting brackets and hardware for tool-free or simple installation. Check your crossbar and roof specifications before purchase. Avoid overloading it; the stated limit applies when weight is evenly distributed.
GARVEETECH Dual-Side Roof Cargo Box
This hard-shell box is best for buyers who want dual-side access and a stated 165-pound maximum capacity. It offers 12 cubic feet of storage and measures 54.3 by 31.5 by 13.4 inches. The ABS shell is described as waterproof and UV-resistant, while the aerodynamic shape is intended to reduce wind noise and fuel consumption.
The listing says it fits vehicles equipped with a roof rack, including cars, vans, and SUVs, but directs buyers to verify compatibility with their rack. Its 12-cubic-foot capacity is less than the larger options above. Choose it for its stated load limit and two-sided access rather than maximum storage volume.
Buying Guide: How To Choose A Large Car Roof Box
How much storage do you need?
Compare listed volume, dimensions, and load capacity rather than relying on the word “large.” The Relaxcabine lists the most volume at 26 cubic feet, while the Thule, iBirdie, PM PERFORMOTOR, and GARVEETECH list 14, 15.3, 13, and 12 cubic feet, respectively. Volume describes space; load capacity describes the maximum stated weight. They are not interchangeable.
Does your vehicle need crossbars?
Most hard-shell options in this guide require a roof rack or crossbars. The iBirdie listing says it can be used with or without roof racks and includes door hooks. Before ordering any carrier, confirm your vehicle’s roof type, rack configuration, and the product’s mounting requirements. Also check the vehicle manual for its roof-load limit, including the weight of the carrier and its contents.
Should you choose a hard shell or a soft carrier?
A hard shell provides a rigid enclosure and is a practical choice for buyers who want a box-shaped carrier. A soft-sided model can offer more flexible attachment options and may fold or store differently, though the iBirdie listing does not specify a folded storage size. Match the construction to your cargo, installation setup, and storage needs.
What access and security features matter?
Dual-side opening can make loading easier when the vehicle is parked in a tight spot or when cargo is easier to reach from one side. Review the listed closure and locking features, but do not assume every box has the same lock system. Follow installation and loading instructions, distribute weight as directed, and secure cargo before driving.
Frequently Asked Questions
What is the largest roof box in this list?
The Relaxcabine has the largest stated volume at 26 cubic feet and a listed load capacity of 150 pounds.
Which option has the highest stated weight capacity?
The GARVEETECH lists a maximum capacity of 165 pounds. Confirm that the vehicle and roof rack can support the loaded carrier.
Do these roof boxes fit every car?
No. Hard-shell models generally require compatible roof racks or crossbars. Check the vehicle and product fit requirements before purchase.
Is a roof box waterproof?
Several listings describe their hard shells as waterproof or weather-resistant. The iBirdie soft carrier is described as waterproof. Follow each product’s setup and closure instructions to help protect cargo.
Can I carry skis or snowboards in a roof box?
The Thule listing specifies skis and snowboards, and the Yakima product listing also mentions skis and snowboards up to 195 centimeters. Check interior dimensions for the specific item you plan to carry.