MATERIAL: Outer: Oxford fabric. Lining: Nylon.SIZE: 11.8 "L x 5.9 "W x 17.7 "H / 30x 15 x 45 CM. It fits up to 15.6" laptop.USB PORT DESIGN: Built-in detachable USB cable design, great convenience for charging your electronic devices via connecting your own power bank. (Please noted that this backpack doesn't power itself, usb charging port only offers an easy access to charge.)LARGE CAPACITY: Interior: 2 open pockets, a padded laptop sleeve pocket fits up to 15.6" laptop. Exterior: 2 zipped pockets, 2 side pockets.NOTICE: It glows in the dark after absorbing light, please refer to the luminous effect in the pictures.