Tommee Tippee
The mainstream Closer to Nature bottle is a polypropylene vessel with a plastic collar and a silicone nipple whose built-in anti-colic valve vents air - so the milk sits in plastic from fill to feed. Tommee Tippee also sells a glass Closer to Nature version, but the flagship, most-sold bottle is all-plastic in the milk path. Everything is BPA-free, which is an additive claim rather than a material one.
How clear are their specs?
Listings and packaging consistently say "BPA-free" and name the silicone nipple, but the polypropylene bottle and collar are described more loosely as "BPA-free plastic," and the specific resin is not always spelled out per part.
Products to avoid
Documented so you know what to skip — each still has a full breakdown and sources.
