100% WATERPROOF - Made of military grade material and heavy duty UV coated tarpaulin, Urethane Coated Zipper, Hook&Loop Closure located on flaps for all-around WATERPROOF PROTECTION; LARGE STORAGE SPACE - Large 21 cubic dimension (L 52" x W 39.5" x H 17.5") can hold all luggage of a family easily (6-8 suitcases). Quick solution to increase the vehicle's storage capacity, and keep your gear clean and dry; DURABLE & HEAVY DUTY - Made of pirme material offers the best weather protection for even extreme conditions and elements such as wind, sun, rain, snow, or sand great for camping traveling sports tailgating; EASY TO USE - The rooftop cargo bag come with 1x anti-slip mats, 1x luggage lock, 6x security hooks, and 1x storage box, it can be quickly and easily installed in minutes; Made of soft shell material, it can be folded into the storage bag to save space while not in use; SUPERIOR SECURITY - The cargo carrier bag come with a bonus combination lock, it will not only prevent the zippers from slipping, but also adds security to luggage.