This is the classic MSR water bag (Dromedary Bag). It's a convenient piece of gear for carrying and storing water during camping, mountaineering, backpacking trips, and more. Made with rugged 1000D fabric for tough use. Also recommended for those looking for the old logo model. A water bottle with a quick-connect bottle adapter for quick and easy opening and closing. MSR water filters (MiniWorks EX, SweetWater Microfilter, and AutoFlow Gravity Filter) can be directly connected to the mouth thread of this bottle. Made of strong 18-8 stainless steel, it's a safe, BPA-free bottle that doesn't use plastic.