The all-new Aether Backpacks boast Osprey's best-fitting systems so anyone can trek technical terrain comfortably, and the Aether 65 Backpack is the biggest in the bunch. Sized for weeklong trips and weekenders, the Aether 65 is a solid choice whether we're carrying heavier loads or just enough gear for a night. The back torso adjusts vertically to customize the fit for all sizes, and On-the-Fly shoulder strap and waist belt adjustments ensure quick-and-easy micro-adjustments that we can cinch on the trail. Osprey not only integrated a rain cover, but also treated the main fabric in DWR in case you don't get the cover on in time. A LightWire frame offers surprisingly stiff rigidity for how light the pack weighs, and Airscape mesh provides breathable ventilation on your back.