10 Best Rooftop Cargo Boxes 2026 in the United States

The Thule Motion 3 XXL Low is a great choice if you need a large rooftop cargo box with plenty of storage space, offering 18 cubic feet of volume. Its wing-shaped, forward-leaning design helps reduce wind drag, which can improve your car’s fuel efficiency during travel. The box is made from aluminum, making it sturdy and durable, though it is not water resistant, so it might not fully protect your belongings in heavy rain.

Weighing 25.4 kilograms, it’s on the heavier side but still manageable considering its size. Mounting the box is straightforward thanks to Thule’s PowerClick system, which gives a clear click when securely attached, making setup fast and secure without extra hassle. The wide handle allows you to open and close the lid smoothly with one hand, and the SlideLock system provides good security by locking the lid automatically and showing when it’s safely closed.

Optional accessories like an interior light and protective liners add convenience but come separately. This cargo box suits those who want a spacious, well-designed carrier that balances easy handling with secure attachment. However, if you frequently drive in wet conditions, you might want to consider a fully waterproof model.

The Thule Force 3 L US rooftop cargo box is a solid choice for anyone looking to increase their vehicle’s storage space, especially if you lead an active lifestyle. It offers a generous 16 cubic feet of capacity, which is roomy enough to hold gear for road trips, sports equipment, or camping supplies. Weighing around 36 pounds, it’s not the lightest box but still manageable for most users. Made from durable plastic, it’s designed to withstand everyday use and various weather conditions, with water-resistant protection to keep your belongings dry.

Its aerodynamic shape helps reduce wind resistance and noise while driving, which can make long trips more comfortable. The mounting system stands out for being quick and secure, featuring a simple click to let you know the box is properly attached. Plus, you can load and unload gear from both sides of the vehicle, which is a big convenience when parking tight or loading with others.

Security is well-covered with the SlideLock system, which automatically locks the lid and clearly signals when it’s secure, giving peace of mind that your cargo is safe. While it’s a bit heavier than some other models, this trade-off comes with greater durability and strong build quality. This cargo box works well for families, outdoor enthusiasts, and anyone needing extra storage without sacrificing ease of use or security.

The Thule Motion 3 XXL rooftop cargo box is an excellent choice for those needing a large, durable storage solution for road trips or outdoor gear. It offers a roomy 21 cubic feet of space, capable of carrying up to 165 pounds, which makes it suitable for bulky items like camping equipment or luggage. The aluminum construction provides strength and a premium feel, although it is not fully water resistant, so it is best suited for dry or light weather conditions.

Its aerodynamic, wing-shaped design helps reduce wind drag, potentially improving fuel efficiency compared to boxier models. Mounting the box is hassle-free thanks to the PowerClick quick-mount system, which signals when the box is securely attached, offering a tool-free setup that is convenient for occasional users. The lid opens and closes smoothly with one hand, aided by a wide handle, simplifying loading and unloading. Security is enhanced with the SlideLock system that locks the lid tightly and clearly indicates when it’s secured, providing peace of mind when leaving your vehicle unattended.

Additional features such as optional interior lighting and protective liners enhance usability but may increase the overall cost. The cargo box is relatively heavy (about 35 kg), which may make installation challenging for one person. While it does not offer full water resistance, it is solidly built and comes with a limited lifetime warranty. This rooftop carrier is ideal for travelers and families seeking a spacious, secure, and sleek storage solution with easy mounting and access; however, those frequently driving in heavy rain or requiring complete waterproofing might prefer other options.