Nalgene On The Fly (OTF) Rep. Cap, Iguana (Green/White)
Some people think this is our best cap yet. Push the button to pop the top. When you flip it all the way back there is a little friction to keep the top from closing and hitting you in the nose. Close it up, hear the click, flip the bail and your bottle is now leakproof. A smooth rolled lip on the mouth makes for a pleasing drinking interface.