Klean Kanteen · Lunch Boxes & Food Containers
Klean Kanteen Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid
Lower concern. Food-contact stainless steel has no inherent PFAS need.
Klean Kanteen's vacuum-insulated food container uses stainless steel and silicone, materials not requiring PFAS treatments. No brand PFAS claims or disclosures found; however, bare stainless steel presents minimal PFAS risk for food storage.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, silicone gasket lid seal
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
food packaging is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Silicone gasket degradation
Repeated dishwasher cycles or high heat exposure may cause silicone to crack or harden over years of use, compromising the seal but not leaching hazardous chemicals. Replacement gaskets are typically available.
Bacterial growth in seal crevices
If gasket is not dried thoroughly after washing or if the container sits filled for extended periods without cleaning, organic growth is possible in the seal groove. This is a hygiene issue rather than a chemical hazard.
What’s reassuring
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
Stainless steel corrosion or leaching
Food-grade 304 stainless steel is resistant to corrosion and does not leach iron, nickel, or chromium under normal food storage conditions, even when filled with acidic beverages. No documented cases for this product type.
BPA & bisphenols
Silicone is not a PVC or polycarbonate derivative and does not require plasticizers like phthalates; BPA is not a known component. However, Klean Kanteen does not publish third-party testing of gasket composition.
Source: FDA ↗Microplastic shedding
Stainless steel and silicone do not shed microplastics. No microplastic concern applies to this product.
The full breakdown
What it's made of and why it matters
The body is food-grade stainless steel (typically 18/8 or 304-grade), which is chemically inert and does not leach metals into food under normal use conditions. The lid seal is silicone, a synthetic rubber polymer chosen for its flexibility, temperature resistance, and lack of BPA or phthalates. Vacuum insulation (double wall with air/foam gap) is passive and contains no chemical additives that contact food. This material combination is among the safest for food storage because neither component has known endocrine disruptors or heavy-metal leaching pathways.
The brand's record and disclosure
Klean Kanteen has built reputation around stainless steel as a BPA-free alternative and does not market PFAS-related claims, suggesting either confidence in material safety or silence on the topic. No major recalls or contamination incidents are on record for this product line. The brand does not publish third-party testing results or detailed material specifications on their website, which is typical for mid-range consumer brands but limits independent verification of gasket composition and metal purity.
How it compares in its category
Stainless steel food canisters like this one present lower chemical leaching risk than plastic alternatives (which may contain BPA, BPS, or phthalates, especially if heated) or ceramic-coated containers (which can shed glaze particles if chipped). They are comparable to glass in inertness but more durable and thermally efficient. The main trade-off is that stainless steel offers no window to see contents and may retain odors or stains, but these are use-experience issues, not safety concerns.
If you buy it
Hand wash the lid and gasket regularly; do not run through dishwasher unless the manufacturer explicitly approves, as repeated heat cycling can degrade silicone seals over time. Inspect the gasket annually for cracks, discoloration, or hardening; replace it if you notice signs of wear. Do not fill with boiling liquids continuously, as thermal stress weakens seals. Keep the interior dry between uses to prevent any mold growth in crevices around the seal.
What we don’t know
- Basis
- Model estimate, 82% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Klean Kanteen has made none
Formulations change between production runs, so check the current label. How we grade.
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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.