Alton Wet Dry Backpack 20L 20L capacity Weather resistant material made to withstand the elements Waterproof welded seams, coated clips Clip closure Backpack clip and straps Comes with a separate attachable 15" laptop sleeve bag Exposed zipper on front storage pocket A quilted padded back and an adjustable chest compression strap A water bottle holder on both sides Dimensions: 16" x 24" x 5"