Mizu
Mizu's bottles are food-grade 18/8 stainless, and most ship with a plastic loop cap. What sets them apart for plastic-conscious buyers is that Mizu sells a dedicated all-stainless replacement cap (M-series and standard), so the drink path can be reduced to steel plus a small silicone seal. Plastic is the default but is easy to design out with the steel cap.
How clear are their specs?
States 18/8 stainless for bodies and the stainless replacement caps, but the gasket/seal material and whether the stock loop cap contacts the drink are not spelled out on product pages.
Lead testing disclosure
Mizu's FAQ acknowledges that vacuum-insulated bottles use a lead-containing sealing pellet in manufacturing, covered by a base cap and backed by a lifetime warranty if it becomes exposed - but this is a disclosure of a design/risk detail, not a third-party lab report or test numbers for lead/cadmium. No named lab, no dedicated safety/testing page found.
- manufacturer https://www.mizulife.com/pages/faq acknowledges a lead-containing sealing pellet under the base cap on vacuum-insulated bottles, without publishing test data
