Designed for Mountaineering, alpinism, ice/vertical climbing, and 4-season backpacking. Featuring GoLite's Unlimited Ergo-Flex™ Suspension System that utilizes a pliable corrugated polystyrene framesheet with super-strong, ultra-lite aluminum dowels for excellent load transfer and carrying comfort, the Perspective is not only durable and comfortable with heavier loads, but weighs just over 3 lbs! The Perspective features durable Arrowhead Cordura® construction as well as a spacer mesh foam back and shoulder harness for comfort and increased air circulation. Features: Unlimited Ergo-Flex™ Suspension System Load lifter straps, floating top lid with dual side release buckles, stretch panels for snug seal Dual compression straps on each side Two side mesh water bottle pockets with angled opening for easy access Twin vertical compression straps secure gear to pack and cinch lower pack to lumbar and hips Single ice axe loop with Velcro® retention strap 3-liter hydration sleeve with two hydration tube ports Sternum strap Haul loop Reflective logo on shoulder strap 2 overlapping, zippered large front pockets Reflective zipper pulls Removable waist belt Specs: Weight: MD, 3 lb 4 oz Volume: MD, 3950+500 cu in Sizing: SM (16-18"), MD (18-20"), LG (20-22") Color: Denim