Made of polyester, the inner layer cover with coating offers reliable protection of rain resistance, ideal for any rainy activities. Top-quality Super-Bright and reflective strapto be seen in any weather condition. The elastic and cross adjustable buckle straps provided extra stability, make sure your backpack get fully covered, protect your backpack even in heavy wind. Each backpack cover comes with a RAINPROOF STORAGE POUCH that you can just clip it to your backpack, you will never be unprepared for the sudden rain shower.