Whether you’re trying a route on the South Face of Denali or heading into the Karakoram, when conditions dictate a need for additional gear or an overnight kit, the Patagonia Ascensionist Pack expands to handle the load. The pack features an integrated, asymmetrical spindrift collar that opens wide and closes in a single motion for fast packing. A secondary collar protects your gear from ugly weather, allows serious overstuffing, and holds gear securely when the pack is hanging at belays. The removable frame sheet, made from a lightweight aluminum rod and covered with mesh, provides support for weighted loads and moves with you as you bend and flex. Ergonomic shoulder straps (with load lifters) match your torso’s contours for 24-hour comfort, and the padded hip belt is removable when you prefer a simple webbing belt. Four rows of exterior daisy chains provide lashing options for a rope, helmet, and pad; ice tools attach via an integrated buckle and tool pocket. Other details include compression straps to carry skis and cinch down loads, an asymmetric profile for elbow clearance, and a zippered pocket on the lid for quick access to small essentials. Made from lightweight yet durable 6.25 oz 210-denier nylon double-ripstop and 6.05 oz 400-denier nylon ripstop treated with a polyurethane coating and a DWR (durable water repellent) finish, and lined with a 1.8 oz 40-denier nylon double-ripstop with a polyurethane coating and silicone finish.