The Atmos AG 50 is the best-fitting, most ventilated and comfortable pack ever made for traditional backpacking trips lasting a weekend or more. The innovative AntiGravity suspension makes it feel like you're carrying less weight and seamlessly wraps around your body, which means you'll enjoy every mile more than ever. From easy to use stretch mesh side pockets, Stow-on-the-Go trekking pole attachment, and FlapJacket for lidless use, the Atmos AG 50 is still the top contender. Backed by Osprey's All Mighty Guarantee, forever.Key AttributesANTI-GRAVITY SUSPENSIONOur Anti-Gravity suspension features a continuous backpanel of lightweight mesh extending from the top of the backpanel to the hipbelt to provide unmatched comfort and ventilation. The seamless structure automatically contours to the body, providing outstanding fit and unrestricted movement.FLAPJACKETA removable floating lid can be replaced with a fixed FlapJacket to protect your gear and minimize weight.ORGANIZATIONAn adjustable stretch mesh front panel pocket provides additional external storage and organizational options. Dual zippered front panel pockets* allow additional internal storage and organizational options. *65L onlyFeatures Anti-Gravity suspension - feels like you are carrying less weight than is in your pack Removable floating top lid with dual zippered pockets and web attachment points Integrated FlapJacket protects gear when top lid is removed Stow-on-the-Go trekking pole attachment allows you to stow your poles in steep terrain or whenever you need your hands free Adjustable harness and Fit-on-the-Fly hipbelt to dial in perfect fit Internal hydration reservoir sleeve accommodates up to a 3L reservoir Front stretch mesh pocket stores rain gear for easy access when skies darken, or wet gear after the downpour stops Dual access stretch mesh side pockets for storing water bottles and other gear with InsideOut side compression straps Dual upper and lower side compression straps stabilize loads and maintain a streamlined profile Zippered hipbelt pockets keep snacks and smaller items close at hand Lower zippered sleeping bag compartment with removable divider Dual ice tool loops Removable sleeping pad straps Sternum strap with integrated safety whistle Carry Information ANTI-GRAVITY SUSPENSIONLightWire-tensioned, full peripheral frame comfortably transfers pack load ANTI-GRAVITY BACKPANELTop to bottom suspended mesh wraps shoulders, back and hips for a fully integrated fit ANTI-GRAVITY MESH HARNESS Adjustable suspended harness with structural load-lifter bar for load transfer and comfort Die-cut foam lower and mesh ExoForm wrap upper ANTI-GRAVITY / FIT-ON-THE-FLY HIPBELT Suspended mesh hip wrap for load transfer and comfort Adjustable Fit-on-the-Fly hipbelt Specs Load Range: 25-40 lbs. Small: Volume: 2868 IN3 / 47 L Dimensions: 30.71H X 14.96W X 15.35D IN. Weight: 4.13 LBS. Medium: Volume: 3051 IN3 / 50 L Dimensions: 32.68H X 14.96W X 15.35D IN. Weight: 4.21 LBS. Large: Volume: 3234 IN3 / 53 L Dimensions: 34.65H X 14.96W X 15.35D IN. Weight: 4.29 LBS. Fabric: Main: 100D X 630D Nylon Dobby Accent: 210D High Tenacity Nylon Bottom: 420HD Nylon Packcloth