This 100% leak-proof Klean Kanteen Twist Cap is the ideal cap for your Klean Kanteen TKWide water bottle. You can turn the cap half a turn so that the nozzle rises and you can easily drink from the bottle. In addition to the stainless steel straw, a plastic straw has also been added. This allows you to extend the straw for the extra large bottles, such as the TKWide 32oz and 64oz.