Zojirushi · Insulated Drinkware Tumblers
Zojirushi Stainless Carry Tumbler
Lower concern. Bare stainless steel contact surfaces, no known PFAS risk.
Zojirushi stainless steel tumblers use bare stainless steel for liquid contact, reducing PFAS risk. Exterior plastic and seals are not clearly specified, but no PFAS concerns are publicly documented for this product line.
Shop Zojirushi on Amazon →Material
Stainless steel interior, plastic exterior
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
This tumbler combines a stainless steel interior (typically 18/8 or 18/10 grade, which is corrosion-resistant and non-reactive) with a plastic exterior shell. Stainless steel does not leach metals into beverages under normal use, making it one of the safest contact materials for food and drink. The plastic exterior is a secondary barrier that does not contact the contents; its composition (likely polypropylene or ABS) is not a direct ingestion concern as long as the interior surface remains undamaged.
The brand's record and disclosure
Zojirushi is a Japanese thermal housewares manufacturer with decades of market presence and no major product safety recalls or regulatory violations on record for their drinkware. The brand does not publicly disclose detailed material certifications or PFAS testing results, which is typical of the category but represents a gap in transparency. Their products are generally compliant with FDA food contact regulations and Japanese safety standards, though independent third-party testing data is limited.
How it compares in its category
Stainless steel interior tumblers are among the lowest-risk beverage containers on the market, comparable to glass or ceramic mugs but with superior thermal performance and durability. Most competitors in this price range (Hydro Flask, Contigo, YETI) use the same basic construction and pose similar low-hazard profiles. The primary differentiator is manufacturing quality and seal integrity, where Zojirushi has a reputation for durability; plastic exterior alternatives are functionally equivalent.
If you buy it
Keep the plastic exterior away from direct heat sources (dishwasher safe, but hand washing prolongs life). Inspect the interior for scratches or pitting periodically; minor cosmetic wear is normal and does not compromise safety, but deep gouges warrant replacement. Do not place in the freezer (thermal shock can crack the seal) or use with caustic cleaners. Replace the lid gasket or tumbler itself if the seal degrades, as loss of insulation is the main failure mode, not a safety issue per se.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Plastic exterior degradation and leaching
No documented cases of harmful leaching from Zojirushi tumbler plastic under normal use conditions. Risk is minimal because plastic does not contact beverages directly, and exterior plastics (typically PP or ABS) are lower concern than soft plastics, even if scratched.
Stainless steel interior corrosion or nickel release
High-quality 18/8 stainless is highly resistant to corrosion and nickel leaching in acidic or salty beverages, but prolonged contact with strong acids (lemon juice, vinegar) or chlorine-heavy water could theoretically increase surface reactivity over years. This is not a documented issue for Zojirushi products specifically.
Seal integrity and bacterial growth in lid
Like all reusable beverage containers, the lid gasket can trap moisture and become a site for mold or bacterial growth if not dried thoroughly after washing. This is a maintenance issue rather than a manufacturing defect; regular cleaning and air-drying the lid prevents this.
Thermal shock or seal failure from extreme temperature swings
Some users report that placing a hot-filled tumbler directly into freezers can cause the seal to separate or crack over time. This is a durability concern and potential leak hazard, not a chemical hazard, but it shortens product life.
Heavy metals in coatings or adhesives
No cadmium, lead, or other heavy metal coatings are applied to Zojirushi stainless tumblers; stainless steel itself is the finish. Adhesives used to bond plastic to steel are not in contact with beverages and are not a documented concern for this brand.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More insulated drinkware tumblers grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.