Osprey Duro 15 Hydration Pack with Reservoir - Medium/Large - Men's Trail Running - Hydration (Alpine Black)The Duro 15 is built for big days where your pack is the only aid station youll find. For runners more interested in routes than races, with plenty of room for all day or even multi day kits. Whether you sip bottles or use a reservoir, the Duro 15 will keep you company and see you through the longest of days. Convenient features, like 15 liters of capacity, hipbelt pockets, included hydration, soft flask compatibility (or use both for long, water