Osprey Duro 15 with Reservoir

From OMCgear

The Duro 15 designed for your most committing trail running and race pursuits is a formidable companion. As the miles pass by and support fades further and further into the background you need a reliable vest pack that&';ll go the distance. With its 2.5-liter reservoir and ample room for food and gear yet a slim and stable design the Duro 15 was designed to push the limits of what marathoners and ultra-runners are capable of. Hip and harness pockets are ergonomically located to give you easy on-the-move access to your snacks supplements and gear without sacrificing your pace.