This Rockagator Rain Cover is a flexible and waterproof cover for backpacks up to 70-Liter capacity. It’s made of an ultralight, water-repellent ripstop nylon and is guaranteed to keep rain rolling off your pack. The rain fly has two straps that enable you to lock this cover down on your backpack so it won’t shift or blow around (or off) during a windy rain storm. With its stretchy elastic opening it will easily slide around your pack and adjust to your needs. With this versatility it could be used to wrap up any type of outdoor gear that needs to sit out in the weather. M116