Born and raised among the tallest peaks of the Colorado Rockies, the Duro Dyna Family has grown to support runners all over the world in various disciplines and terrain. Whether you’re looking for a podium, fastest known time or beautiful activity as the sun rises, Osprey keeps you comfortable, in rhythm and hydrated no matter the distance.Hydration IncludedFrom handhelds to vestpacks, you'll stay hydrated whether you're training or running unsupported ultras. Speed & StabilityDesigned for a close to body fit, Duro/Dyna provides bounce-free fit that's lightweight and stays out of the way of your running goals. Easy Gear AccessSmart pocketing keeps the essentials, like water, gels, whistle and phone, accessible while on the trail.Key Features:Two extra-large stretch mesh soft flask/food harness pocketsCompatible with Hydraulics Soft Flasks [not included]Two lower stretch mesh food/supplement harness pocketsVertical zippered harness slash pocket for valuables or phoneSnap-in adjustable/removable dual chest straps for customized stabilityTuckaway safety whistleLarge dual-entry stretch mesh rear pocket