Common sense dictates that in the long run, going light with a pack that has no suspension burns more energy than gained by ounces saved.  The Exos Series incorporates a ventilated suspension built for comfort with super light weight.  The result is a highly specialized pack built for day long to multi-week adventures. The Exos 46 is the ultimate thru hike and super lightweight backpack, thanks to our AirSpeedSuspension, which teams a 6061-T6 Aluminum frame with a 3D tensioned mesh backpanel, and side crescent ventilation. The AirSpeed suspension works in tandem with the supportive and ventilated Bio-Stretch™ harness and hipbelt for fit and comfort unheard of in a one kilo pack. The Exos features an internal sewn-in backpanel sleeve with clip attachment to accommodate up to three liters of hydration. At the top of both sides of the pack you will find H20 icons marking the routing points for your hydration tube.