1.USB port design: This USB backpack external built-in USB charger, built-in charging cable, to provide you with a more convenient way to charge on foot. Please note that this backpack does not power itself, and the USB charging port only provides an opportunity for easy charging. 2.Lots of storage and pockets: A separate laptop compartment holds 15.6-inch laptops, 14-inch and 13-inch MacBooks/laptops. A spacious packaging compartment, spacious, can store daily necessities, technology and electronic accessories. The front compartment features multiple pockets, pen cases and keychain hooks to keep your belongings organized and easier to find. 3.Function and : The luggage strap allows the backpack to be placed on the trunk/suitcase and slide over the trunk upright handle tube for easy carrying. There is a hidden anti-theft pocket on the back to protect your valuables from thieves. Make your journey and travel easier wherever you go. 4.Comfortable and breathable: Adjustable shoulder strap and back with comfortable and breathable mesh design to reduce shoulder pressure. Comfortable airflow foam back design, soft multi-panel breathable mesh liner, good heat dissipation, will not become wet and cold, provide maximum back support for your back. Foam padded top handles make it carry-on luggage.