Boon
Boon isn't a plastic-free brand overall, but the Nursh has a genuinely clever material story: the milk sits in a food-grade silicone pouch and flows through a silicone nipple, while the polypropylene shell it clips into never touches the milk. So although there's plastic in the product, it's out of the drink path - a silicone-only contact profile. Most of Boon's other feeding gear is conventional plastic.
How clear are their specs?
Boon states plainly that the milk only touches platinum food-safe silicone (the pouch and nipple) and that the shell is polypropylene outside the drink path - an unusually clear food-contact breakdown.
