AOTU 40-90L Rainproof Backpack Cover Rain Cover Waterproof Bag Free Foldable for Outdoor Travel Riding Climbing Hiking Camping (Blue) Specially reinforced, keep your backpack and belongings dry from rain, mud and dust. Perfect for outdoor, travel, riding, climbing. Seamless construction for weather-tight protection. Can be free folded in the sachet, it is portable and convenient. With elastic design, it is able to adjust the size according to different backpacks.