Osprey Dyna 15

CampSaver.com says:
Osprey Running Packs Dyna 15 - Women's Reef Teal XS/S 10002007. For runners more interested in routes than races. With a women's-specific fit for bounce-free stability and comfort and plenty of room for all-day or even multi-day kits. Whether you sip bottles or use a reservoir the Dyna 15 will keep you company and see you through the longest of days. Convenient features like trekking pole storage included hydration soft flask compatibility (or use both for long water-scarce routes) and bounce-free carry it is the pack for aspiring ultrarunners and adventurers everywhere.