The Osprey Ariel Pro 65 is a lightweight take on the women's Ariel line, aimed at mountaineering and demanding multi-day trekking. At 68 liters it weighs just 1754 g, giving a 38.8 l/kg ratio — the best in this group of packs and on par with technical alpine packs. Osprey rates it for trips up to 6 nights, with a maximum load capacity of 27 kg.
The suspension pairs an aluminum stay frame with a tensioned mesh panel and a removable padded hip belt with pockets; torso length is adjustable, though the frame itself is not removable. The main compartment opens only from the top, and there are no front pockets or an integrated rain cover — typical trade-offs of a weight-focused build. In exchange, it has a separate sleeping bag compartment, two stretch-mesh side pockets, internal pockets, and stow-on-the-go trekking pole attachment. Compression straps sit on the sides only, and dual ice axe loops account for technical terrain.
The fabric is a durable combination of NanoFly 210D nylon and 200D UHMWPE fiber with a PFC-free DWR finish, with an EXTREEMA-reinforced bottom. It's hydration-compatible up to a 3-liter reservoir (not included). Osprey lists a 2-year warranty backed by a free repair program. It suits experienced mountaineers and alpinists on demanding multi-day trips where low weight is the priority.