CamelBak 2016 Octane 18X Hydration Pack Nylon Imported This expandable pack is perfect for 3+ hours of any adventure Antidote reservoir features Quick Link system, easy open/close cap, lightweight fill port, Dryer arms, center baffling and low-profile design Key pack features: ultra-light materials, center expansion zip, front and back reflectivity, safety whistle Designed to carry extra layer, food, headlamp, trail maps, compass, trekking poles Camelbak Got your Bak guarantee: if we build it, we'll Bak it with our lifetime guarantee Five exterior pockets.