Thermos
Thermos builds insulated bodies from stainless steel but relies on plastic for the parts you actually drink through. The popular FUNtainer kids straw bottle, for example, has a stainless body but a polypropylene push-button lid and an LDPE straw stem, with only the silicone straw tip being non-plastic - so water passes through plastic on the way up. Widely available and durable, but not a plastic-free design in the drink path.
How clear are their specs?
Publishes a materials FAQ naming the FUNtainer lid as polypropylene, the straw stem as LDPE, and the spout as silicone, but this detail lives in the FAQ rather than on product pages, which lead with "BPA-free."
Lead testing disclosure
Thermos's FAQ states products "are tested rigorously by independent testing labs" and asserts no risk of lead exposure, but names no lab, no test numbers or detection limits, no dedicated safety page, and doesn't mention cadmium at all - a bare assurance, not disclosure. Lead Safe Mama has criticized Thermos for lacking transparency and does not include current Thermos lines among its independently-tested recommended brands.
- manufacturer https://thermos.com/pages/faq bare assurance of independent lab testing with no lab name or numbers
Products to avoid
Documented so you know what to skip — each still has a full breakdown and sources.
