1.Super Waterproof: Dont let a drop of water in.Waterproof wear-resisting Nylon material can make it. It can resist water of 1500-2500mpa hydraulic pressure rate. 2.Dual-layer Design. The exterior layer adopts wear-resistant Nylon to avoid scratching and dirt. The inner layer adopts waterproof coating to avoid rain and snow. 3.Easy to Use: Adjustable buckle to adjust the cover to fit your backpack. It will make the cover stick to the backpack to avoid falling off. 4.Compact and Portable: It can be easily folded so that you can put it in the side bag of your backpack for storage. 5.Ideal for Outdoor Activities: Perfect for outdoor travel, riding, climbing, hiking and so on. Size: Height: 40-53cm, Length: 20-32cm, Width: 15-20cm Packing list: 2 pieces of rain cover