For Hiking, Camping, Biking, Outdoor Activities, And Travel, Consider The Imported Nylon lining Buckle closure 3 Layer Waterproof Technology: 100% WATERPROOF - Made of high-quality Tear Resistant Nylon Material, external waterproof coating, Inner layer cover with PU coating offers reliable protection of up to 5000 mm of rain resistance, Ideal for any rainy activities, 100% Money back guarantee if you are not satisfied. ULTIMATE ALL-OVER PROTECTION: The Elastic and Cross Adjustable Buckle Straps provided extra stability and 50% more coverage, make sure your backpack get fully covered, protect your backpack even in heavy wind. ULTIMATE HANDY: Weighing only 2.2~3.6 ounces(Size: S~XXL), 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. Made of 190T Nylon features WEAR-RESISTING and DURABLE, protecting backpack from scratch, dirt, sand. Suitable for Backpack 15-90L, Please check the size chart in the 6th picture or description. FREE Exchange size if not match WITHOUT RETURNING WORRY-FREE 24-MONTH WARRANTY LIFETIME CUSTOMER SERVICE