Level8 Atlas Backpack - Notebook carrying backpack - 17" The Atlas is made with a nylon exterior - it is padded between compartments, and the compartments are lined with smooth nylon. The base of the bag is a heavy plastic The carrying strap on top is a double grommet, plastic encased steel cable, with a free-floating soft plastic grip for your hand. The zippers are all heavy duty, and the straps are shock-absorbing, reinforced, and attached to the back with an additional reinforcing layer of nylon over the doubly stitched attachment points. The photos of the straps and back are a bit further on, in the "comfort" section. The Atlas has six exterior compartments - looking at the front view again, you can see the two easy-access zippered side pockets.