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Our Top Choice

Thule 626 Force Rack, Black, XX-Large

Pros: Aerodynamic, tough, big and easy to load and unload. Will last for years with proper care. Extremely high quality materials.

Cons: Large size may overwhelm some vehicles. Can be difficult to store when not in use.

Summary: An incredibly good cargo box - if you are looking for the best on the market, this is your best bet.
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SportRack SR7018 Vista XL Rear Opening Cargo Box

Pros: Can easily be mounted by one person; features a solid locking mechanism. Incredibly good value for the price.

Cons: Can be difficult to fit just right to your rails.

Summary: If you don't want to go for the larger, more expensive models, this is the best choice. You won't find a better product for this price.
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WeatherTech 60001 RackSack Cargo Carrier

Pros: Solid construction for a soft-shell. Is relatively budget friendly.

Cons: Might not last as long as hard shell cases and fits awkwardly on some rails.

Summary: Great for a soft shell carrier, but not quite on par with the Rightline Gear 100S30 Sport 3.
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Yakima Skybox 21 Carbonite Cargo Box

Pros: Has one of the most secure locking systems to be found. Aerodynamic design with lots of storage space.

Cons: Heavy and bulky, which means it can be difficult to store and mount.

Summary: Decent price and secure locking systems means less chance of it opening at highway speeds.
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Rightline Gear 100S30 Sport 3 Car Top Carrier

Pros: Large cargo box; durable construction; budget friendly price; can mount without roof rails.

Cons: Fabric construction not as protective or strong as some hard shell cargo boxes.

Summary: It's big and easy on the budget, but it might not last as long as some hard shell boxes.