The lightweight and streamlined Osprey Atmos AG LT 50L backpack keeps us moving quickly on multi-day trips into the backcountry. Osprey's AG system seamlessly integrates the hip belt with the tensioned back panel and peripheral frame , providing optimal load transfer and a personalized fit and the spacer mesh and cut-out foam ensure a lightweight, comfortable fit. The side zipper allows us to take multiple layers of food or snacks hidden inside without unfastening the floating cover and the built-in rain cover can be easily deployed when the weather changes.