Title: Fits klean kanteen!
Product review: I bought these to use for my klean kanteens that have the sippy adaptor and they fit perfectly. The only drawback is that they are very easy to lose. The sippy spouts used to get covered with dust, lint, etc., but with these caps that's no longer an issue. Sometimes I notice condensation inside so they do have to be cleaned regularly to prevent any mildew/mold from growing there. But overall they work great for the price.
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