The all-new Ariel Backpacks boast Osprey's best-fitting systems so anyone can trek technical terrain comfortably, and the Ariel 55 Backpack is perfectly sized for weekenders and overnighters. The back torso adjusts vertically to customize the fit for all sizes, and On-the-Fly shoulder straps and waist belt adjustments can be cinched 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.