Backpack - Large Water-Resistant Bag, Green Mountainside Nature Landscape Blue Sky Print. Have you got room for all that? With our roomy and durable backpack, you will! This bag is made from spun polyester and weights 1.3 lbs, just enough to be light, strong and long-lasting. Grab it, stow it, throw it onto the seat next to you, this backpack can take it, and so will you, wherever you go!