Klean Kanteen · Insulated Travel Drinkware
Klean Kanteen Insulated TKWide Cap
Lower concern. Stainless steel core with no known PFAS-prone coatings.
Klean Kanteen uses stainless steel construction without Teflon-family coating linings or nonstick coatings. Cap materials and gaskets are not disclosed for PFAS content, introducing minor uncertainty.
Shop Klean Kanteen on Amazon →Material
Stainless steel bottle, plastic cap and silicone gasket
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 TKWide Cap is built around a 18/8 stainless steel double-wall interior, which is chemically inert and does not leach metals or off-gas under normal use. The plastic cap and silicone gasket are the only potential contact points with beverages; modern food-grade plastics in caps typically use polypropylene (PP) or co-polyesters, which have low leaching profiles at room and warm temperatures. Silicone gaskets are generally considered stable and non-reactive across temperature ranges typical for drink bottles.
The brand's record and disclosure
Klean Kanteen markets itself as a toxin-free alternative to disposable plastics and is known for emphasizing durability and material integrity, though the brand does not publish detailed third-party testing results or formal certifications (e.g., NSF, BPA-free certification) on its website. The company has not made explicit public commitments regarding PFAS avoidance in its supply chain, which is noted as 'silent' stance. No recalls or established safety controversies are on public record for this specific product line.
How it compares in its category
Stainless steel insulated bottles dominate the reusable market and generally outperform plastic-only and glass alternatives in terms of chemical stability and durability. The TKWide Cap design is mid-range in the Klean Kanteen portfolio; it offers simplicity over their vacuum insulated models but similar material safety. Compared to mass-market alternatives (e.g., Hydro Flask, YETI), Klean Kanteen has positioned itself in the consumer-friendly, non-technical-language safety space rather than pursuing third-party lab certifications.
If you buy it
Hand wash the cap and gasket regularly to prevent mold or bacterial growth in seams, particularly if used for warm beverages or left damp. Avoid prolonged contact with hot liquids above 80 degrees Celsius (176 degrees Fahrenheit), which may increase any minor plastic off-gassing, though the design is rated for normal hot drink use. Replace the silicone gasket if it becomes discolored, cracked, or loses elasticity, typically after 1-2 years of regular use. Do not use abrasive scrubbers on the cap or gasket, as this can degrade surface coatings.
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 cap leaching (BPA/BPS)
No BPA or BPS identified in Klean Kanteen's marketing or independent testing of this product. Modern polypropylene caps carry minimal leaching risk at room temperature and warm beverage use.
Silicone gasket degradation and leachables
Silicone is generally non-toxic, but degradation over time or exposure to prolonged heat can theoretically release trace siloxanes. No specific testing of the TKWide Cap gasket is on record; risk is low if gasket is replaced regularly.
Stainless steel corrosion and metal leaching
18/8 stainless steel is highly resistant to corrosion and leaching of chromium or nickel under normal beverage use. No established cases of metal contamination from this product have been reported.
Bacterial or mold growth in cap assembly
The threaded cap and gasket design can trap moisture if not dried thoroughly. Regular hand washing and air drying mitigate this risk; dishwasher use may not fully dry internal threads.
Cap or gasket failure under temperature stress
Repeated thermal cycling (hot fill, freezer storage) may shorten gasket lifespan or cause cap seal degradation. Klean Kanteen does not publish explicit temperature range limits for the cap assembly, only general 'safe for hot beverages' language.
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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More insulated travel drinkware 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.