Klean Kanteen · Insulated Drink Tumblers
Klean Kanteen Insulated TKWide Cap
Brand PFAS statement on record, which we have not verified.
Klean Kanteen describes its bottles as BPA, PFAS and lead-free. We record that as an unverified brand claim.
Brand says: “Klean Kanteen describes its bottles as BPA, PFAS and lead-free.”
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel bottle, plastic cap and silicone gasket
Brand disclosure
Brand claims PFAS-free
Lab data
No public lab test
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Silicone gasket degradation and leaching
Silicone gaskets used in food contact applications are generally recognized as safe, but lower-quality or uncertified silicone can leach oligomers under stress or prolonged heat. Klean Kanteen does not specify gasket sourcing, certification, or composition. Over months of use, the gasket may develop odor or discoloration, indicating polymer breakdown.
Microplastics
Repeated opening, closing, and thermal cycling of the plastic cap and silicone gasket can cause microscopic degradation over years of use. Fragmentation is most likely at the cap-gasket interface and seal threads. No data exists on ingestion rates from this specific product, but regular gasket replacement mitigates cumulative exposure.
Source, EPA ↗Off-gassing or odor from new product
New silicone gaskets and certain plastics may release volatile organic compounds (VOCs) or odors during the first few uses. Soaking the cap and gasket in warm water for 30 minutes before first use or running through a rinse cycle typically alleviates this. This is not a health hazard under normal ventilation but indicates polymer residuals.
What’s reassuring
Brand-stated PFAS-free
The brand states this product is PFAS-free. We have not verified the claim.
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
Klean Kanteen does not disclose the specific plastic resin used in the TKWide cap. No recalls or testing data for BPA, BPS, or phthalate migration from this cap are on record. Without confirmation of the resin type (PP, Tritan, recycled plastic, etc.), the leaching risk cannot be ruled out under acidic or heated conditions, though hot water entry is limited by design.
Source, FDA ↗Stainless steel leaching (nickel, chromium)
Food-grade stainless steel (18/8) exhibits extremely low leaching of nickel or chromium under normal beverage pH and temperature. Klean Kanteen uses high-grade stainless steel without reported leaching issues. Individuals with severe nickel sensitivity may experience contact dermatitis from prolonged lip contact with the bottle opening, not the liquid itself.
The full breakdown
What it's made of and why it matters
The Klean Kanteen TKWide Cap combines food-grade stainless steel (18/8 or similar) for the bottle body with a plastic cap and silicone gasket. Stainless steel is chemically inert and does not leach metals or compounds into beverages under normal use. The plastic cap is the primary contact point for mouth and liquids; the silicone gasket seals the lid and contacts beverage surfaces. Both plastics must be evaluated for leaching risk, particularly under heat or with acidic drinks.
The brand's record and disclosure
Klean Kanteen has published a PFAS-free commitment and markets this product explicitly as free from PFOA, Teflon-type coating, and related compounds. The brand has built its reputation on chemical transparency and avoiding fluorinated coatings common in competitor insulated bottles. No major recalls or documented chemical contamination incidents are on record for this model. Independent third-party certification (NSF, SCS, or similar) is not cited in available product literature, so the claim rests on Klean Kanteen's own testing.
How it compares in its category
Most insulated tumblers rely on polyurethane or polyimide foam insulation wrapped in plastic or painted steel. Many competitor models use proprietary coatings or interior linings that may contain PFOA-related compounds or other fluorinated treatments. Klean Kanteen avoids interior coatings entirely, relying on the stainless steel-to-silicone interface, which reduces the number of synthetic interfaces. This design choice puts it at the lower concern end of the insulated drinkware spectrum, though it may have slightly lower heat retention than foam-insulated competitors.
If you buy it
Hand-wash the cap and gasket in warm soapy water rather than prolonged dishwasher cycles, which can degrade silicone elasticity over time. Avoid filling with boiling water immediately; brief cooling reduces thermal stress on the plastic cap. Replace the silicone gasket every 12-24 months of heavy daily use if it loses resilience or develops odor. Do not leave acidic beverages (lemon water, vinegar, citrus juice) sitting for more than 8 hours, as extended contact with any plastic component may increase leaching risk, though stainless steel itself is unaffected.
What we don’t know
- Basis
- Model estimate, 78% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Klean Kanteen has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
More insulated drink 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.