【OVERSIZED 21 CUBIC FEET】Massive 21 cubic feet (L52" x W40" x H17.5") of space can easily hold all luggage of a family of 5-6. Most other roof cargo carriers are small and there is not enough room to accommodate everything you need. 【HIGH DENSITY 1000D PVC】Features triple-layer high density 1000D PVC fabric. This material is 2 times stronger than 500D PVC fabric, which most other rooftop bags adopts and can easily rip. The coated surface can effectively protect your luggage against rain, grit, snow, wind and sun on the road. 【UPGRADED WATERPROOF ZIP】While other rooftop carrier bags let in water through the normal zipper, we've upgraded it to a waterproof zipper and fitted it with a widened zipper flap that helps keep your items 100% dry. 【EASY TO INSTALL】：Adakiit rooftop cargo carrier fits for any car, truck, or SUV. If there is not roof side rails on your car, it can be quickly and easily installed to roof rack in minutes with 8 Reinforced Straps. NOTE: All seams are heat welded and stitched to ensure they are watertight. that your luggage will stay safe and protected in all weather conditions during your travels. But please note that it's not 100% waterproof under rainstorm weather.