Description of Arcteryx NAOS 55 Backpack Whether you are backcountry skiing through the Mt. Hood pines, or hard core busting out a hiking trail at the Gorge, the Arcteryx Naos 55 Backpack is the perfect pack for your outdoor adventure. Innovative design takes this backpack to a whole new level. The welded backpack consisting of 420ACT Vaportight fabric offers optimal durability. The Arcteryx Naos 55 Backpack is much lighter than other packs in the same size range, due to advance construction techniques. Waterproof construction keeps all of your gear dry. When you hit massive whitewater while rafting down the Deschutes River, this pack is so airtight, it will even withstand falling in the water. Highly functional in mobility, the disc assembly is mounted on the hipbelt and connected to a similar plate on the back panel, enabling the assembly to rotate whenever your hips pivot; this will enhance comfort on your journey, as well as reduce fatigue. The days of traditional sewing techniques are over with this pack, as every component is bonded with 420ACT VaporTight™ fabric. The Arcteryx Naos 55 Backpack earned both a 2006 Editor's Choice award from Backpacker magazine and a 2006 Gear of the Year award from Outside magazine; this pack speaks for itself and embodies the future of backpack design. Complete functionality, mobility, light weight and a stylish streamline look, make this the perfect backpack. 2006 Backpacker's Magazine Editor's Choice award winner for revolutionary design and performance! Features: Key fabrics: 420-denier Advanced Composite Textile (420ACT) VaporTight™ includes a urethane mixture on both faces for bonding and weatherproofing, Spacermesh and dense open cell foam on the harness and back panel 3D Shaping takes just 2 pieces of fabric and gives the pack three dimensional volume, greatly reducing seams and contributing to a streamlined look Bonded construction is fully seam sealed Rolltop™ closure provides a waterproof top closure for varying loads Waterproof hydroport and hydration bladder pocket Monoframe™ back panel includes a durable Kydex® framesheet and twin 6061 aluminum stays Radial formed shoulder straps shaped with an anatomical curve for added comfort Binary™ hipbelt components, including a Load Transfer Disc™ and housing, provide dynamic radial shift Removable top pocket Side access Kangaroo Pocket with WaterTight™ zipper External compression straps, 3 on each side Capacity: 3,175 cu. in. (52 l) in short, 3,420 cu. in (56 l) in regular, 3,600 cu. in. (59 l) in tall Weight: 4 lbs. 6 oz. (2 kgs.) in short, 4 lbs. 10 oz. (2.1 kgs.) in regular, 4 lbs. 14 oz. (2.2 kgs.) in tall