-External USB with integrated charging cable. -Made of waterproof oxford, protect your laptop from rain. – Soft breathable padded back cushion shoulder strap makes it light and comfortable. – Front zippered pocket can hold tablet and other small gears. -Anti-theft zip pocket for valuables. – USB charging port, with humanized usb charging interface design, it’s great to enjoy convenient charging connected to the port of a capable charger and your electronic device, easily keep your smart phone full power anytime, anywhere. -Internal structure: computer cases, mobile phone bags, document bags, zipper bags, patch pocket and pen bag. – This bag can be used for daily outing, day trip, vacation, travel, day hiking, school, camping. Parameters: Material: Oxford cloth and inner polyester Dimensions: 19.5in * 14in * 3.6in (49cm * 38cm * 14.2cm), Laptop compartment layer: 15.5in * 10.8in (39 * 5cm * 25.5cm cm) Weight: 1.7LBS Applicable: “unisex” Package includes: 1x laptop backpack, 1x USB cable (power and device not included)