Filter for Klean Kanteen/Hydro Flask - Aquagear Straw Cap Filter fits Klean Kanteen and Hydro Flask Stainless Steel Bottles - Removes Chlorine, Fluoride, Lead - BPA-Free 75 Gallon Filter Capacity DOES NOT INCLUDE BOTTLE. Fits Klean Kanteen Classic (27 and 40 oz) bottles and Hydro Flask standard mouth bottles (21 oz). See fit guide in image gallery. PERFECT FOR ON-THE-GO, ACTIVE, AND SUSTAINABLE LIFESTYLE. Never be without water or be forced to buy pricey and wasteful bottled water on-the-go ever again. Just refill your bottle at any municipal tap water source and sip away. MADE IN THE USA, MADE USING FOOD GRADE MATERIALS AND BPA-FREE. FILTERS UP TO 99.99% OF TAP WATER CONTAMINANTS. The Aquagear Tap Water Filter removes harmful contaminants that most other filters miss, including chlorine, fluoride, lead, mercury, heavy metals, industrial and agricultural runoff, and trace pharmaceuticals. ALL OF THESE have been found in tap water supplies across the United States. GET CLEAN WATER, GIVE CLEAN WATER. For every straw cap filter we send you, we provide 6 months of clean water to someone in need in Uganda, Tanzania, or Cameroon.