It is made of polyester fibre which is a high strength wear-resistant fabric, so the backpack is antistatic, easy to clean and not deformed. Exquisite workmanship makes the bag attractive. It will give you a feeling of comfort and freedom. Having a USB cable is the other advantage of it. In a word, it is your best choice.Features:Choose the comfortable fabrics.The bag body side has a charging socket where can charge at any time.Bags on the back is equipped with convenient pockets can be inserted into the pull rod, easy to carry.The interior of the bag is clear, you can easily categorize items.The length of shoulder straps is adjustable.Specifications:Item weight: 730g / 1.6lbPackage weight: 760g / 1.67lbItem size: 43 * 26 * 10cm / 16.9 * 10.2 * 3.93inPackage size: 47 * 33 * 8cm / 18.50 * 12.99 * 3.15inNotice:The bag has a built-in charging cable, simply connect the mobile charger to the cable, and the USB connection can be charged.(No power supply.)Package list:1 * Backpack