With built-in USB interface and cable, great convenience for charging your electronic devices. Made by oxford fabric, durable and water resistant, ensure a long-lasting usage everyday. Approx dimensions is 12.5*5.5*18.7 inch (L*W*H), can be equipped with 16 inch laptop, and kinds of other pockets for storing your phone, passport, keys, umbrellas, books, wallet, snacks, suitable for occasions like sports, gym, work, school, business, travel, and outdoor activities. Unobtrusive rear strap fits around the extension handle of a spinner suitcase for secure stacking and hands-free mobility. Breathable and adjustable padded mesh strap, so very comfortable to wear it, relieve the pressure of your shoulders when you carry many items with you.