Multi -Functional Travel Bag with USB Charging Waterproof 。USB Charging Port: Built-in USB port design allows you conveniently to charge cell phone by connecting power bank without opening backpack on the go. (Power bank is not included) Water Resistant Fabric: Made of water resistant, durable and breathable nylon fabric. Dual padded, reinforced and adjustable shoulder straps provide optimum comfort and fit snugly around your shoulders allowing. Large Capacity: Inner main pocket: The laptop lining can put an 15.6\" laptop. Outer: 2 front zipper pocket, 2 side pockets and 1 front pockets. Wide Open Design, rectangular opening providing easy access to the items at the bottom. Not be too bulky but roomy for everything you need.