The Osprey Atmos AG 50 features Osprey’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 Osprey’s clever Anti-Gravity suspension system—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.