Extra thick material & heavy duty durability ? our rooftop bag is made from the thickest, highest quality materials - 22 oz. Heavy duty polyester canvas and the only one on the market 99.9% waterproof endurance ? 360-degree shielded zipper lining will prevent almost all water from entering. Abrasion and tear resistant vinyl coating will last under extreme weather, rain, sun, snow Fast and easy installation ? extra thick seatbelt style straps and buckles can secure 3, 000 lbs - have peace of mind wherever and whenever you drive Large storage capacity ? 15 cu. FT. Can fit up to 5 Medium sized suitcases and fits on full sized sedans, all SUVs and vans - strong but flexible material Flex to fit odd-shaped items with ease. Length: 46" Width: 39" Depth: 14" Comes with everything you need ? comes with rooftop protective mat to prevent any sliding or scratching of the car roof and 2 seatbelt style harness straps with 10 foot length for secure installation