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Designed for mountain bikers who demand performance but arent in need of a ton of storage the Osprey Siskin 12 hydration pack comfortably carries up to 2.5 liters of water and has 732 cubic inches of streamlined storage. The packs suspension consists of a foam framesheet and a channeled mesh-covered Airscape backpanel. A padded mesh-wrapped harness provides carrying comfort while staying out of your way when youre riding. An Airmesh-wrapped hipbelt works in tandem with an adjustable sternum strap to help you dial in fit. The interior of the pack is accessed by a large U-shaped zipper while a separate compartment holds the included Hydraulics 2.5-liter reservoir with direct-zip access. A magnetic sternum strap bite valve attachment is included so your hydration hose remains securely in place but close at hand. There are also tool organization options a zippered scratch-free heat-embossed slash pocket and zippered hipbelt pockets. On the exterior of the pack there is a fabric shove-it pocket for bulky or wet gear. A dedicated bungee lets you attach a traditional biking helmet while the upper side compression straps double as a system to carry full-face helmets. A blinker light attachment point lets you add a light not included for better visibility in low-light or at night. The Osprey Siskin 12 hydration pack is available in your choice of colors.