Klean Kanteen · Insulated Drink Tumblers
Klean Kanteen 20oz TKWide with Café Cap, Tofu
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, stainless steel 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.
Powder-coat cap degradation over time
The powder-coated steel Café Cap can chip or flake with repeated dishwashing or abrasive cleaning. Flaking powder is not known to be toxic, but bare metal exposure underneath could theoretically allow minor corrosion. Hand washing and air-drying extend cap life.
Bacterial biofilm in cap threads and seals
Like all reusable bottles, inadequate cleaning of the threaded cap interior and seal ridges can allow bacterial or mold colonization, particularly if the bottle is not fully dried between uses or left closed with residual liquid.
Thermal stress on seals at extreme temperatures
Boiling water or sustained high heat can degrade elastomeric seals in the cap over time. While the stainless steel bottle itself handles heat, replacement caps may be needed after years of very hot beverage use.
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.
Lead
Food-grade stainless steel (304) used in beverage bottles does not intentionally contain lead or cadmium. No recalls or test data suggest contamination in Klean Kanteen bottles.
Source, ATSDR ↗Metal leaching from stainless steel
Properly passivated food-grade stainless steel is extremely resistant to leaching. No documented cases of nickel, chromium, or iron leaching at levels of concern from Klean Kanteen bottles in normal use (non-acidic beverages, room temperature to warm).
The full breakdown
What it's made of and why it matters
This bottle is food-grade stainless steel (304-grade typical for Klean Kanteen) with a stainless steel cap. Stainless steel is chemically inert and does not leach metals into beverages under normal use, making it a material not linked to common beverage contamination concerns. The TKWide design is a wide-mouth tumbler optimized for ease of cleaning and ice insertion, and the Café Cap is a powder-coated steel closure designed for hot and cold use.
The brand's record and disclosure
Klean Kanteen has explicitly committed to being PFAS-free and markets this claim prominently on its website and product packaging. The brand does not use non-stick coatings (Teflon-type coating) or water-resistant treatments that typically contain PFAS in the drink bottle category. Klean Kanteen has been transparent about phasing out PFAS-containing liners in their food containers and has faced no major recalls or safety controversies related to leaching or material composition in their core bottle products.
How it compares in its category
Stainless steel insulated tumblers show lower concern in the drink container category compared to glazed ceramics with leaching risks, plastics with BPA concerns, and non-stick coated alternatives with Teflon-type coating fume risk. Klean Kanteen competes directly with brands like Hydro Flask and S'well; all three use stainless steel construction, but Klean Kanteen's explicit PFAS-free stance and long brand history in chemical-free water bottles give it a slight safety edge in disclosure and commitment.
If you buy it
Hand-wash the cap and interior regularly to prevent bacterial biofilm buildup in crevices; the powder coat on the cap can degrade if abrasively scrubbed or placed in dishwashers repeatedly. Do not leave beverages sitting for extended periods (beyond 24 hours) as stagnant liquid can support microbial growth. Inspect the cap seal annually; if powder coating visibly chips or flakes, discontinue use of that cap and replace. The stainless steel body itself is durable for years; caps typically last 3-5 years with normal use.
What we don’t know
- Basis
- Model estimate, 85% 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.