Rain & Dust Cover Waterproof with Pouch for Laptop Bags and Backpacks School Bag Cover, Luggage Bag Cover. Material: Nylon. Lightweight waterproof rain and dust cover suitable for medium and large backpacks. Separate Pouch to keep wet Rain cover With elastic on all sides, it is convenient to adjust the size according to the backpacksThe buckle strap ensures that the cover stays intact around the bag Can be easily packed and stored when not in use.