AYAMAYA 40L Adjustable Waterproof Rain Proof Backpack Cover Raincover Capacity: 35-40L. Specially reinforced, keep your backpack and belongings dry from rain, mud and dust. Seamless construction for weather-tight protection With elastic design, it is able to adjust the size according to different backpacks. Can be free folded in the sachet, it is portable convenient and ultra-light weight. Perfect for outdoor, traveling, riding, climbing High reinforced elastic design ensures the rain cover stay still on your backpack to protect it under harsh environment such as windy and rainy days. Nearly 360 degree protection for your backpack. The exposed part of your backpack after you put on the backpack will be all covered by our rain cover. Happily enjoy your travel,hiking,climbing and anywhere else with possibly water around. To get a perfect protection for your backpacks,Please check sizes before buying.