The light weight and supremely ventilated Osprey Atmos AG 50 Backpack lets you tick away the trail miles in comfort. Featuring Osprey's new antigravity suspension, it contours to your body, providing the ultimate in comfort and mobility. Antigravity back panel uses lightweight mesh from the top of the back panel to the hip for lightweight and maximum ventilation. Antigravity suspension provides exceptional load transfer and maximum comfort. Adjustable harness allows the user to easily change the torso length of the pack. Fit on the Fly hip belt extends 5 in. to accommodate different hip sizes and provides the perfect fit. Internal hydration sleeve. Floating top lid can extend to accept oversize loads or be removed to save weight. Stow On The Go trekking pole attachment is designed to quickly carry trekking poles while wearing the pack. Dual ice tool loops for lashing and stashing your tools. Stretch mesh side pockets provide an external gear carrying option. Dual zippered hip belt pockets for easy access to often needed items.