The CamelBak Octane 18X weighs in at just a pound and with 18L of fully expanded cargo capacity, this pack is perfect for 3+ hours of nonstop action. The Octane 18X features an independent suspension, easy to reach stash pockets, a harness pocket and an expandable cargo pocket so you can comfortably carry everything you need which moving fast. Great for extended trail runs or adventure races. The CamelBak Octane 18X also includes the new 100 oz. Antidote reservoir which has a quick-snap cap that tightens in a quarter turn and a quick-disconnect tube system.