Klean Kanteen · Insulated Drink Tumblers
Klean Kanteen TKWide Twist Cap Bottle
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 body, plastic cap
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.
Plastic cap degradation from heat stress
Polypropylene caps can weaken or warp if repeatedly exposed to boiling water while sealed. Risk is minimal with typical use patterns (lukewarm to hot (not boiling) beverages), but high-temperature filling shortens cap lifespan.
Mold or bacterial growth in closure seals
Threaded closures can trap moisture and food debris if not cleaned regularly, creating an environment for mold. This is a maintenance issue, not a material hazard, and is preventable with routine washing.
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.
Microplastics
No reported incidents of microplastic shedding from Klean Kanteen caps under normal use. Thread degradation over years could theoretically release particles, but this is not documented for this product.
Source, EPA ↗Lead
Food-grade stainless steel (18/8) is regulated to exclude lead and cadmium. Klean Kanteen sources stainless that meets FDA and NSF standards; no contamination is on record.
Source, ATSDR ↗Off-gassing or VOC emissions from plastic cap
Polypropylene caps used in food-contact applications do not typically off-gas volatile organic compounds at room temperature. No VOC concerns are documented for Klean Kanteen closures.
The full breakdown
What it's made of and why it matters
The TKWide Twist Cap features a food-grade stainless steel (18/8) body, which is chemically inert and does not leach metals or compounds into beverages under normal use. The plastic cap is the only component requiring scrutiny; Klean Kanteen uses polypropylene (PP) or similar food-contact plastics in their closures, which are stable at room temperature and moderately warm beverages but can degrade if exposed to boiling water or prolonged high heat. The wide-mouth design and threaded closure rely on mechanical sealing rather than surface coatings, eliminating risks from glazes, enamels, or chemical sealants.
The brand's record and disclosure
Klean Kanteen publicly commits to avoiding PFOA, PFOS, and related compounds in bottle linings and closures. The brand has maintained consistent messaging on this issue since the mid-2010s and is widely recognized in the stainless steel bottle market for transparency. No major safety recalls or chemical contamination incidents are on record for this product line. Independent certifications (e.g., NSF, FDA food-contact compliance) are standard for their products, though specific test results are not always publicly detailed.
How it compares in its category
Insulated stainless steel bottles like the TKWide show lower concern for leaching risk compared to plastic-lined or aluminum bottles. Most competitors in this price and category (Hydro Flask, S'well, Nalgene stainless models) use similar materials and construction; the TKWide's advantage is Klean Kanteen's public commitment to avoiding PFAS compounds and long track record. Plastic bottles and coated alternatives carry greater risks of BPA or microplastic shedding, making stainless the premium choice from a chemistry standpoint.
If you buy it
Do not fill the bottle with boiling water and immediately seal; allow beverages to cool slightly before capping to avoid pressure buildup and plastic stress. Replace the plastic cap every 12 to 18 months, or sooner if threads become worn or discolored. Hand wash the cap rather than placing it in the dishwasher to extend its life. The stainless steel body is durable for years; inspect it occasionally for dents or discoloration, though cosmetic wear does not affect safety.
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.