Nathan Elevation 2-Liter Hydration Vest, Nathan Blue, One Size Multiple zippered compartments and stretch mesh stash pockets for organization and increased capacity Adjustable compression pulls to cinch down excess when pack is below full capacity Newly engineered 3 way propulsion harness stabilizes side to side and up and down movement of bladder and other contents for a bounce free ride Two front bottle pockets hold up to 22 oz/550 ml TruFlex bottles Vest has trekking pole cllips and a perforated back panel for breathability and weight reduction