The USWE Race 2.0 is USWE&';s lightest hydration pack - a minimal, race-focused design for XC, marathon and gravel racing where every gram and every breath counts. NDM(TM) 1.0 PRO harness - 4-point elastic fit for zero bounce without restricting breathing About 230 g without the hydration system 2.0L Elite hydration bladder with Plug-n-Play coupling and an insulated sleeve to keep water cool longer 3D mesh back panel for maximum ventilation Main fabric from recycled ocean plastics with a PFAS-free DWR finish Chest fit range approx. 33"-43"