100% Nylon Imported 【Quality & DurabiLity】The backpack cover consists of tear-resistant nylon and a high-quality PU coating, offer reliable protection against rain and moisture. 【Anti Slip Off Design】There are buckle straps and elastic rim to keep backpack cover secure on the pack . The convenient buckle straps at the top can help tighten and prevent the backpack cover from slipping off while the elastic attaches firmly on your backpack , never worry about your backpack cover blowing away in strong winds or being pushed off by shoulder straps. 【Highly Reflective】Visible to all road users from a distance of 100 meters. A cheap insurance for more visibility and increased protection during the day, at dusk and at night. 【Convenient & Compact】Weighing only 2.0~3.0 【Convenient & Compact】Weighing only 2.0~3.0 ounces(Size: XS~XL). Each backpack cover comes with a RAINPROOF STORAGE POUCH. You can easily attach it to your backpack. Perfectly suitable for hiking, camping, cycling, fishing and other outdoor activities. 【Available in Various Colors and Sizes】3 colors and 5 size optional, allows you to choose the right size according to your bag. Protect your backpack from rain, dirt and scratches during outdoor activities. Note: Kindly check the size of your bag size before ordering[Item size: XS: 8-17L; S:18-25L; M:26-40L; L:41-55L; XL:56-70L GUKOY Waterproof Backpack Rain Cover with Reflective Strap (18-70L), 2 Adjustable Anti Slip Cross Buckle Strap, Rainproof Snowproof Dustproof Anti-Frost Covers