All Tommee Tippee bottles are BPA-free. They’re made of a plastic called polypropylene that’s lightweight, easy to clean, and completely safe. BPA – that’s (CH₃)₂C(C₆H₄OH)₂ for you science geeks – is a chemical that’s been used in some plastics since the 1960s and it’s believed to mess around with your hormones. It’s generally not good, so we don’t use it.