OUTAD Waterproof Backpack Rain Cover with Reflective Strip Reflective strip for high visibility in fog and pitch black darkness. Extreme durability: made from rip-resistant polyester oxford fabric, bottom of rain cover double sided to protect against soak-through and tears. Superior waterproof protection: guaranteed not to let rain into your backpack. Compact and portable: folds down and includes a drawstring bag for storage. Capacity and versatile: elastic design provides adjustability and select from 2 size options (35-55L, or 55-80L).