Size- 30 to 35 litres .Durable Backpack rain cover is made of heavy-duty polyester fabric that is waterproof, dustproof, tear resistant. Waterproof material of the cover protects the backpack/luggage against water and dust (heavy rain, spills, mud and more) Elastic material around the edge of the cover, it is able to adjust the size according to different backpacks & buckle holds the cover in place for optimal protection. Each backpack rain cover has waterproof pouch to store your wet back bag rain cover, you will never be unprepared for the sudden rain shower. Perfect for school bag, backpack, daypack, overnight bag for outdoor travel on Bikes .