Osprey Dyna 15

Osprey says:
The women's Dyna 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 Dyna 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. Made with 100% recycled materials.