The Duro 15 is built for big days where your pack is the only aid station you'll 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-scarce routes), and bounce-free carry, this is the pack for aspiring ultrarunners and adventurers everywhere.

• Included Osprey Hydraulics® 2.5 LT reservoir with QuickConnect and sternum strap magnet for bite valve Front panel zippered main compartment and separate zippered internal reservoir sleeve Front panel zippered slash pocket Accessible dual lower side panel zippered stretch mesh pocket Lower stabilizing/expansion compression straps Snap-in adjustable/removable dual chest straps for customized stability Vertical zippered harness slash pocket for valuables or phone Dual extra-large stretch mesh soft flask/food harness pockets Dual lower stretch mesh food/supplement harness pockets Trekking pole attachment Tuckaway safety whistle Front panel stretch mesh compression pocket Hipbelt stabilizing wrap with zippered pockets S/M [34-40" / 86-102cm] M/L [39-45" / 99-114cm] - chest measurements