REI Garage offers the Osprey Rev 12 Hydration Backpack in Flash Green for $51.73 with free shipping. That's $3 below our November mention and the lowest price we could find now by $25. Features include a 2.5-liter hydraulic reservoir, magnetic sternum clip, zippered stretch mesh BodyBelt pockets, zippered top slash pocket, weatherproof media pocket, and a front-panel bungee compression.