Come and Check Our Promo Solutions.This backpack is made of waterproof and durable Eco-Friendly nylon fabric with Two "S" curve PADDED shoulder straps, relieve the stress of shoulder, simple but comfortable back design offer your great back support, making your working, journey and travelling more convenient. With built in USB charger outside, this usb backpack offers you a more convenient way to charge your phone while walking. Perfect for colleage high school big student backpack for boys, girs, teens, adults. Pls check inventory and detailed info with us before placing your orders.