Klean Kanteen · Insulated Travel Drinkware
Klean Kanteen 36oz Rise Tumbler with Straw Lid
Lower concern. Stainless steel core unlikely to contain PFAS.
Klean Kanteen tumblers use stainless steel construction, inherently lower PFAS risk. Lid material unspecified; brand does not disclose PFAS practices.
Shop Klean Kanteen on Amazon →Material
Stainless steel body, likely polypropylene or polyester straw lid
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
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
The Klean Kanteen Rise Tumbler's core is food-grade stainless steel, which is chemically inert and does not leach metals or breakdown products into beverages across normal temperature ranges. The straw lid is typically injection-molded polypropylene (PP) or polyester, common food-contact plastics chosen for temperature tolerance and durability. Stainless steel avoids the ceramic glaze concerns (lead, cadmium), non-stick coating risks (Teflon-type coating/PFOA), and aluminum leaching problems that plague other drinkware categories.
The brand's record and disclosure
Klean Kanteen markets itself as a health-conscious, eco-focused brand and has built reputation on stainless steel alternatives to plastic bottles. However, the brand does not publicly disclose detailed material sourcing, manufacturing standards, or third-party testing for contaminants on its website or product documentation. No major recalls or safety controversies are on record for this specific tumbler model. The silent stance on PFAS in lid components reflects a gap in transparency rather than confirmed risk.
How it compares in its category
Stainless steel tumblers are among the safest reusable drinkware options because they eliminate polymer-to-beverage contact for the primary vessel. Most competitors in this price range (glass, ceramic, or mixed-material designs) introduce either breakage risk, thermal shock sensitivity, or secondary plastic components. Klean Kanteen's stainless construction is conventional for the brand and aligns with category best practices, though the detachable lid design does introduce a secondary plastic interface that warrants attention.
If you buy it
Wash the straw lid and seal gasket by hand or on the top rack of the dishwasher after each use to prevent bacterial biofilm and mold growth in crevices; do not leave liquids sitting in the tumbler for extended periods. Avoid filling with boiling water if the lid is PP-based, as polypropylene has a melting point around 130°C and may warp or release compounds at sustained high temperatures. Replace the straw or lid gasket every 6-12 months if discoloration, odor, or visible wear develops. The stainless steel body itself is durable indefinitely under normal use.
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.”
Polypropylene lid thermal degradation
If the straw lid is polypropylene, extended contact with boiling liquids or repeated hot-fill cycles may cause warping or release of trace monomers; polyester lids are more heat-stable but risk is present in both plastics above 80°C sustained exposure.
Microbial growth in straw and seal gaps
Klean Kanteen straws and hinged lids are known to trap moisture and bacteria in crevices if not cleaned promptly; this is a maintenance issue, not a manufacturing defect, but is common in user reports on review sites.
Gasket/seal leachables from polypropylene or rubber components
No specific test results or recalls document leaching from Klean Kanteen lid gaskets; polypropylene and silicone gaskets are considered low-risk for food contact under normal conditions, but brand does not disclose gasket material composition.
Undisclosed lid coatings or colorants
Colored or printed straw lids may contain azo dyes or other pigments not detailed on packaging; Klean Kanteen does not provide material safety data sheets for lid components, leaving uncertainty about dye stability or heavy metal content in print.
Stainless steel nickel or chromium leaching
Food-grade stainless steel (typically 18/8 or 304 alloy) is designed to resist corrosion and does not leach nickel or chromium under normal beverage storage; no reports or recalls link Klean Kanteen tumbler use to nickel sensitivity.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% 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.
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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.