Patagonia Ascensionist Pack 45L - 2746cu in Tailored Grey, L Body: 6.25-oz 210-denier nylon semi-dull double-ripstop and 6.05-oz 400-denier nylon ripstop. Aluminum stays with trampoline center give the pack structure and help to support heavy loads Lining: 1.8-oz 40-denier nylon double-ripstop with a polyurethane coating and silicone finish and 200-denier polyester Padded hip belt can be removed to create a simple webbing hip belt Spindrift collar opens wide for easy packing; drawcord simultaneously cinches collar and closes lid