100% WATERPROOF - The car top luggage bag are made of heavy PVC fabric + waterproof coating to ensure no surface leakage. 5 "wide zip cover + 5" long Velcro cover the zipper completely and keep it close to the zipper. Finally, double coat the zipper with a waterproof coating. It can do 100% to prevent water from entering the bag. 20 CUBIC FEET - 52"L x 38"W x 18"H, Extra-large size saves you more interior space. Included a storage bag, fold the soft roof luggag bag into a storage bag, when not in use. SAFETY ACCESSORIES INCLUDED - The roof protection pad prevents the bag from sliding during driving and protects the roof paint. The TSA combination lock will ensure that your luggage is safe during the journey. FUEL CONSUMPTION REDUCE - This rooftop cargo carrier is aerodynamic design that significantly reduces wind resistance and thus saves on fuel costs.It also reduces the risk of being torn by the wind and improves durability. FIT ALL VEHICLES - KING BIRD uses 4 quality door hooks and 8 noiseless straps to make it safe to work in any vehicle with or without a roof rack. Please let us know if you have any questions. We promise 1 year warranty and replacement of all parts.