Great for multi-day climbing trips laden with hardware or for backpackers who believe going light means sacrificing too many comforts of home, the redesigned Osprey Aether 85 backpack offers plenty of volume and a high performance suspension system for all sorts of load toting. For short excursions from camp the IsoForm hipbelt can be threaded through the lumbar pad sewn on the bottom of the detachable top pocket to form a hip pack. But for big loads of camping equipment, Osprey has designed the next best thing to a custom built backpack. The AirScape suspension system not only serves as a rock-solid foundation for evenly transferring the weight to the hips, lumbar, and shoulders, but it also offers superior breathability. The Osprey Aether 85 backpack now offers the IsoForm custom moldable hipbelt technology to match the users unique shape over this important load-bearing surface. The dual density shoulder harness offers a smooth, contoured fit, interchangeable sizes, and no sewn seams against the shoulders as is true of all surfaces on the pack that contact the body. The Osprey Aether 85 backpack can also be considered a hydration pack on steroids. An internal backpanel hydration sleeve with twin exit ports provides customized plumbing and the external dual entry side pockets accommodate one liter bottles for easy access. The Osprey Aether 85 backpack is designed to comfortably carry loads of 45 to 55 lbs. For smaller loads be sure to check out the Osprey Aether 70 and Aether 60 backpacks.