Make sure you're properly hydrated on your next trail excursion or ultra race with the Moxy Hydration Race Vest from Nathan. This pack features a 3 Way Propulsion Harness that moves independently with you as you run, allowing for more natural stride. The contoured, padded back panel ensures comfort over a long day and long miles. Top U zipper access lets you easily access the things you need. A rear zippered compartment features an organizational sleeve and key hanger. Shock cord at the back lets you store an extra layer for quick access, and reflective trim enhances safety during low visibility conditions. The included 2 liter Hydrapak bladder uses a Slideseal closure for easy filling. The thermoplastic polyurethane is both BPA and PVC free. An omnidirectional bite valve lets you confidently slake your thirst without breaking stride.