Come and see our amazing products. Backpack rain cover is made of waterproof polyester,its max capacity is 151.416gal.The Elastic and Cross Adjustable Buckle Straps provided extra stability and 50% more coverage, make sure your backpack get fully covered, protect your backpack even in heavy wind.It is nessassary in rain day.Free shipping and imprinting. Pls confirm with us about the packing info, stock color and exact production time before placing your order.