The Osprey Seral 7 Hydration Pack is perfect for you if you prefer an off-the-back hydration solution instead of an over-the-shoulder pack. This lumbar pack features an included 1.5-liter lumbar reservoir and magnetic bite valve that attaches to the hip-belt for easy access. Some lumbar packs tend to creep around while you ride, well feel rest assured that this one wont, thanks to the compression straps, they pull the pack into your lower back and wrap around your hips for supreme stability, even over technical terrain. Enjoy the zippered main compartment and hip-belt pockets, that fit your spare tube, patch kit, CO2 inflator and more. The Osprey Seral 7 Hydration Pack is the hip-pack of your mountain biking dreams!