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Built with trekking in mind, with an emphasis on long distances in pouring rain, the sleek Naos 55 trekking pack uses exclusive ARCTERYX technology to keep your gear dry and you comfortable. None of your supplies will get wet thanks to Advanced Composite Construction that combines lamination a fiber construction to make a completely waterproof pack.<ul><li>Gear and equipment will stay dry with Advanced Composite Construction that combines fabric and lamination techniques to completely waterproof fabric while reducing weight</li><li>Shoulder your load comfortably with the flush mounted, stretch woven, cushioned monoframe composite backpanel and Rotating Load Transfer Disc that evenly distributes weight</li><li>Your shoulders and hips won't ache thanks to radially formed shoulder straps and an anatomic hip belt that are precurved to enhance comfort and mobility; plus you can add removable padding to the webbing hipbelt when you need it</li><li>Keep moisture out with the drybag rolltop closure that adjusts to the volume and store snacks or your trail map in the removable top lid for easy access</li><li>Clothing and sleeping bag alike will stay dry when encased within the sealed seams and waterproof zippers</li><li>Stow your GPS or snacks for Fido in the Kangaroo Pocket</li><li>Strap down your load so that it won't shift with the 6 compression straps</li><li>Never get dried out - make use of the hydration bladder pocket and waterproof hydroport</li></ul><ul><li>Capacity: 3230 cu in (Short); 3420 cu in (Regular); 3600 cu in (Tall)</li><ul><li>Weight: 4 lb 6 oz (Short) ; 4 lb 10 oz (Regular); 4 lb 14 oz (Tall)</li><ul><li>Fits torso: 16-19 inches (Short); 18 - 21 inches (Regular); 20-23 inches (Tall)</li><ul><li>Material: 420 ACT</li><ul><li>Frame material: EVA, Kydex, aluminum</li><ul><li>Number of pockets: 1 + main compartment</li></ul>Specifications based on size Regular.