Built upon the classic Nathan HPL, the Grit offers all the fabulous features of the iconic Nathan best-seller, now updated with lighter-weight materials and a new shape. Patented 3-way Propulsion Harness??? stabilizes side-to-side/up-down movement of bladder and other contents for a bounce-free ride. Equipped with a 2 L bladder with quick-release valve, highly breathable wall mesh shoulder straps, front bottle pocket and front zip smart phone-compatible pocket and mesh stash pocket. Wt: 9.3 oz. (w/bladder).