If you lose your water supply in the middle of a three-week stay on a big wall, your trip is in trouble. Thats why MSRs Dromedary Bags are made of durable, abrasion resistant Cordura. nylon. Laminated with food-grade polyurethane these water carriers are tougher than typical vinyl products and flexible even in freezing conditions. We dare you to try and rupture or destroy this bag in the backcountrymany have triedbut the Dromedary wins time and time again. Strong 1000 and 500 Denier Cordura Nylon. 3-in-1 Cap lets you drink, fill or pour with ease. Multiple grommets laced with webbing make for easy hanging and carrying.