Klean Kanteen · Insulated Travel Drinkware
Klean Kanteen Rise Tumbler
Lower concern. Stainless steel tumbler with no known PFAS coatings.
Klean Kanteen Rise Tumbler uses 18/8 stainless steel construction without reported Teflon-family coating or nonstick coatings. No public PFAS disclosures or concerns identified for this model.
Shop Klean Kanteen on Amazon →Material
18/8 stainless steel body, likely stainless steel or silicone 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.
The full breakdown
What it's made of and why it matters
The Rise Tumbler is built from 18/8 stainless steel (also called 304-grade), which contains 18% chromium and 8% nickel. This alloy is highly corrosion-resistant and does not require protective coatings like Teflon-type coating or ceramic enamels that can degrade or leach. The lid is typically silicone or stainless steel, neither of which pose leaching concerns under normal use. Stainless steel is inert in contact with food and beverages across normal temperature ranges.
The brand's record and disclosure
Klean Kanteen is known for prioritizing material transparency and has built brand identity around chemical-free construction. The company explicitly avoids BPA, PVC, and phthalates in its product lines and publishes material specifications on product pages. While the brand does not publish formal third-party safety certifications (e.g., NSF, FDA premarket review statements), no recalls or substantiated safety complaints tied to this tumbler model are on record. The brand's silence on PFAS is typical for stainless steel drinkware manufacturers, as the material itself does not require water-repellent coatings.
How it compares in its category
Stainless steel tumblers like the Rise are among the lowest-hazard drinkware options. They avoid the leaching risks of glazed ceramics (which may contain lead or cadmium), the coating degradation issues of nonstick cookware, and the BPA/phthalate concerns of plastic drinkware. The main trade-off is that stainless steel conducts heat readily, making it less insulating than vacuum-insulated competitors, though this is a performance rather than safety issue. Klean Kanteen's pricing and transparency position it above budget stainless alternatives with unverified sourcing.
If you buy it
Hand-wash or use standard dishwasher cycles; stainless steel is durable and does not degrade with typical laundering. Avoid prolonged contact with highly acidic beverages (e.g., vinegar, citric cleaners) in the tumbler itself, as even 304-grade stainless can pit under extreme conditions, though normal juice and coffee pose no risk. The silicone lid should be inspected for cracks or wear annually and replaced if damaged; silicone itself does not leach at room temperature but avoid prolonged contact with very hot liquids above 200°F. Standard care is sufficient; no special maintenance is required.
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.”
Nickel leaching from stainless steel
18/8 stainless steel contains 8% nickel. Leaching is extremely rare under normal use (cold or warm beverages), but prolonged contact with acidic or hot liquids can mobilize trace nickel in susceptible individuals. No leaching has been reported for this product, and regulatory limits for nickel in drinking vessels are not exceeded by standard stainless steel under typical conditions.
Silicone lid degradation and ingestion
If the silicone lid is damaged, torn, or subjected to extreme temperatures, small fragments could theoretically shed into beverages. Silicone itself does not contain BPA or phthalates, but repeated mechanical stress and heat cycling may shorten lid lifespan. Inspection before each use and replacement if visibly compromised mitigates this concern.
Bacterial growth in lid seals
Any reusable tumbler lid with threaded seals or silicone gaskets can harbor bacteria if not cleaned thoroughly after use. This is a maintenance issue rather than a material hazard. Regular hand-washing or dishwasher cleaning on hot cycles prevents biofilm buildup.
Burn risk from thermal conductivity
Stainless steel conducts heat efficiently, so hot beverages will warm the exterior and lid quickly. This is a foreseeable use hazard (not a chemical one) and is typical of all bare metal drinkware; users should be aware when handling.
Heavy metals in printing or branding
If the tumbler has printed logos or decoration, inks could theoretically contain lead or cadmium. No reports of such issues exist for Klean Kanteen products, and modern food-contact inks are heavily regulated; however, specific ink certification is not published by the 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.
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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.