【Excellent waterproof performance】: This car roof bag is made of high-performance waterproof material, using real waterproof zipper, used in extreme weather, and with flip protection. All seams are heat welded and stitched to ensure they are watertight. 100% waterproof and rainproof in extreme weather. 【Universal design】: This top carrier can be well compatible with all kinds of cars. No matter your car have the top rack or not, this car roof bag could suit the situation. 【Rich Components】: The entire product includes a 15 cubic car roof bag, large size anti-slip mat and 3 main adjustable length fixing straps and 2 additional straps. This top carrier is also designed for with reflective strips and 4 handles to maximize the convenience of use. 【Easy to use】: To install the roof bag, you only need to lay the anti-slip mat, place the roof bag on the anti-slip mat and pass the fixing strap through the body of car and connect the two ends of the roof bag. Finally tension the fixing starps to complete the installation. 【After-sales Service】If you have any problems during use, you just simply contact customer service for troubleshooting help, parts, replacement, or refund. We will solve the problem for you within 24 hours.