New in original package, only took out for photos. Size XXS (26" - 32") Hydration is NOT included Bottle Compatible (not included): UltraFlask, Formula 250, Human 20 oz 2.0, or Collapsible Bottle Bryce Thatcher’s pack of choice, the Zygos 4.0 hydration pack is very versatile. This pack is lightweight and high capacity, a comfortable wrap around style with full compression allow for the lowest profile empty or fully loaded. New expandable mesh on the back panel gives 4 liters of extra capacity as well as storage in the front with extra pockets. Whether you are fastpacking, mountain biking, in a fast race, ultra race, or summit assault this hydration backpack is the solution for any athlete. ***************************** Price is firm, shipping discount applied!