Waterproof nylon material. The white part is more of a mild beige color than a solid white, with a built-in USB port designed to charge your phone without having to open your backpack on the go. Waterproof fabric: Made of waterproof, durable and breathable nylon fabric. Double padded, reinforced and adjustable straps provide excellent comfort and fit snug to the shoulder. It can be used as a college backpack, business travel backpack, laptop backpack purse, carry-on bag, doctor's backpack, diaper/mom bag, and for short trips.