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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Klean Kanteen Water Filter Adapter lets you enjoy river, spring or lake water straight from your Klean Kanteen Classic bottle. Simply screw the filter adapter on to your Classic Klean Kanteen bottle and you will then be able to attach most standard backcountry water filters, which can remove off tastes and odors, bacteria and cysts. Even in the Great Outdoors, you can have safe, delicious water from your BPA free Klean Kanteen water bottle.
This backcountry water filter adapter will only work with the Klean Kanteen Classic bottles, but it will work with any size of that series.
Klean Kanteen Filter Adapter: