The dimension of this laptop Bag is 13.5L*6W*19.5H in. The laptop backpack is made of good environment-friendly nylon fabric with new function of water-repellent, keeping your backpack neat and stylish in any case. With built in USB charger outside and built in charging cable inside, great convenience for charging your electronic items via connecting your own power bank, offers you a more convenient way to charge your phone while walking. Please note that this backpack doesn't power itself, USB charging port only offers an easy access to charge.