The Stainless Steel Bottle Hanger is great for hanging a stainless steel bottle over a fire by inserting it into the mouth of the bottle and then releasing. The tension of the spring will hold it in the bottle neck. It will work with all single wall Klean Kanteens, the Pathfinder 32 oz. Stainless Bottle, and stainless steel canteens (it not work on the Nalegene Stainless Steel Bottle). When squeezed together and hooked on itself, it takes up little room in your pack (Bottles in photo NOT included). This little hanger was originally designed to hold the mouth of a fish open so you could easily remove a hook. It has been adapted for use as a bottle hanger and serves the purpose well. You also have a multi-use item, because it can still be used for its intended purpose.