Trekker BäBa wide-mouth bottles, screw-caps, and lids are crafted from #304 Food Grade (high-grade 18/8) stainless steel, are BPA-free, naturally anti-bacterial, lightweight, durable, and will not leach anything into your child's milk, water or juice. All our bottles are designed in the United States and are responsibly made with manufacturing facilities in China Certified in Internationally Standards of Quality ensuring the safest most durable infant and toddler bottles in the world. We believe getting back to basics and close to the heart of nature truly does result in a life more environmentally sound and a safer lifestyle for families. The Trekker BäBa is compatible with a wide variety of leading large mouth silicone nipples and sippy spouts. Safe food grade silicon medium flow nipple. Lid serves as a protective cover and handy snack cup for children. No paint or lacquer anywhere on the bottle -- Puts an end to children ingesting paint flakes or chips. Engraved Logo - Permanent mark of quality and designed to last a lifetime. No liner used inside bottle (pure stainless steel). No hard to clean plastic thread crevices to worry -- helps prevent the growth and build-up of harmful bacteria. Simple & Safe Cleaning - Especially inside and throughout. No glue or adhesives used.