Designed for the serious mountain biker with an appetite for daylong adventure, the Osprey Raptor 18 Backpack is a combination backpack and hydration unit. The pack comes complete with a HydroForm Reservoir, which easily lifts in and out of a specially designed pocket. Hydrate yourself using the 180 degree on/off bite valve, which gives you a constant refreshing flow of liquid out on the trail--no need to carry cumbersome water bottles. Other features of the Osprey Raptor 18 include attachments for your keys, helmet, a magnetic sternum strap buckle to store your water bite valve and a separate interior pocket for your bike tools. Comfortable shoulder and waist straps make the lightweight Raptor a joy to wear--you’ll barely notice you have anything on your back. With the Raptor 18 Backpack, you’ll be fully prepared for any mountain bike adventure.