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All caps and lids are interchangeable with all sizes of Klean Kanteens and we only use non-leaching Polypropylene in our caps, adapters and sippy spouts. Stainless steel loop and flat caps are available for those who prefer that only stainless come in contact with their beverage.

About Plastic Chemicals

Bisphenol A (BPA). A chemical used to make plastic shatterproof, BPA mimics the human hormone estrogen and has been linked to a number of serious health issues, including: early onset of puberty and sexual maturation in females; changes in gender-specific behaviors; ADHD; breast tumors; decreased testosterone; decreased sperm production; learning disabilities; and prostate cancer.

Phthalates. Another “plasticizer” used to soften plastics, phthalates have been shown to disrupt hormonal balances. In 2005 the European Parliament partially or totally banned six separate phthalates for use in children’s toys. Phthalates have been linked to cancer, dramatic changes in male sexual characteristics when exposure takes place in utero (during pregnancy), premature breast development in young girls and lowered sperm count in males.