- Made of waterproof polyester material - Light weight - USB socket This backpack using the waterproof polyester material. Using the exquisite workmanship makes sure its quality and durable. S-shaped wide shoulder straps reduce shoulder pressure and make it easier to use. With smart USB design, you can charge your phone while walking. This product is suitable for shopping, hiking, school, office, and other casual situations. Brand POSO SKU 100273079_NP-1020547382 Pattern Plain Listed Year Season 2018 Material Nylon Leather Material PU Clothing Material Nylon Model 617