Laptop Backpack External USB Charging Port Waterproof Lightweight Computer Rucksack for Up to 15.6 inch Notebook---Black Innovative Design: The backpack internally installed an USB charging cable and external USB charging port, easy to carry and convenient to charge. Tear-resistant and Durable: Using high-quality nylon fabric, water repellent. Ensure the safety of items which place in the laptop backpack. Shock Absorption: Computer bag design with two main separate compartments, which have a function of buffering and shock-proof. Better to protect your notebook. Humanized Design: The top of backpack design a small pocket, convenient to place your business cards, pen, wallet etc. Anti-theft Zipper Design: The back pad tactfully designed an anti-theft zipper pouch and a hidden earphone output hole, which can be safely place your cellphone, wallet etc, enjoy music in the meanwhile.