Description of Osprey Argon 85 Backpack Weighing in less than 6.5lbs the Osprey Argon 85 backpack brings ultimate comfort and expedition load design full circle. This lightweight expedition backpack comes with a barrage of features ideal for the long haul. Its AirScape backpanel with BioForm A/X harness and BioForm CM A/X hipbelt offer superb body-to-pack comfort necessary for extended expeditions. Utilize the convertible top pocket and use it as a lumbar pack for short hikes. Lightweight and durable the Argon 85 backpack helps lessen the heavy load. NEW FOR SPRING 2008! Expedition load haulers have been a staple in the Osprey line for over 20 years. Features: Convertible top pocket/lumbar pack with AirScape lumbar pad Ultralight 40d Sil Nylon AquaSource ReCurve Vertical zip access into main body Zippered easy access side pocket Osprey Side Order compatible with laser cut attachment slots AquaSource ReCurve in the pack AquaSource Recurve on your back Convertible top pocket / lumbar pack Fabric Side Pocket Front panel zipper Front zipppered pocket Pack-to-body interface Sleeping Bag Compartment Stretch Woven Front Pocket Stretch woven side pockets and straps M: 5100 cu. in. (85L) - 5lbs 12oz (2.60 kg.) L: 5300 cu. in. (88L) - 5lbs 15oz (2.70 kg.) XL: 5500 cu. in. (91L) - 6lbs 3oz (2.80 kg.)