External USB port with built-in charging cable. Use it to connect the power bank, then connect your phone or electronic device with original USB cable to the USB port conveniently. Please noted that this backpack doesn't power itself, usb charging port only offers an easy access to charge. 22"H x 12"L x 7"W, Capacity: 35L! One main zipper compartment with cellular elastic foam fits your 17'' laptop against from bumps and falls. The other three functional compartment for wallet, pens, passport and other quick access stuff. The two mesh pockets is good for water bottle, umbrella, then bring it anywhere with you. Several internal unit pockets allow you to keep all of your gear secure and organized in its place. All that, it offers much more space than you would expect from a bag of this size. The innovative weight balance design makes you feel 20%-25% less weight. The body side and shoulder straps have excellent thick breathable mesh padding, offering your back plenty of cushioned comfort. This Tocode backpack is made of water resistant oxford material, and reinforced stitching for lasting durability. Perfects for business traveling, college students and outdoor activities in daily life. Ergonomic top handle, comfort for carrying. Zippers with a Anti-theft lock for free. Adjustable shoulders straps, comfortable to wear. Durable metal key ring, free for your hands. Bottom straps, Special stylish design of this backpack.