The Osprey Atmos AG 50 features Ospreyâ€™s Anti-Gravity suspension system for quick drying ventilation and all-day comfort. This pack is well suited for weekend excursions or quick overnight forays when you are toting less than 40 pounds. The secret to this pack is Ospreyâ€™s clever Anti-Gravity suspension systemâ€”a seamless backpanel composed of lightweight mesh extending from the top of the backpanel to the hipbelt that contours to the body to deliver outstanding fit and unrestricted movement. The Fit-on-the-Fly hipbelt and easily adjustable torso length optimizes comfort on the trail. You can access your gear through the top of the pack or via a zippered front panel. The versatile floating top-lid is removable to shave weight but an integrated FlapJacket is always onboard to protect your gear from the elements.