Corkcicle · Insulated Drink Tumblers
Corkcicle 16 oz Matte Black Canteen
Low concern. Stainless steel canteen unlikely to contain PFAS.
This stainless steel canteen features a matte finish coating with no disclosed PFAS content or independent testing. Stainless steel vessels carry less PFAS risk than treated cookware or textiles.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel with matte powder coat
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Coating degradation over time
Powder coatings can chip or peel with heavy use, drops, or aggressive cleaning. Once the coating is compromised, small fragments could theoretically enter beverages. This is a mechanical failure risk, not a chemical toxicity issue, and is managed by inspection and replacement.
Off-gassing or odor from new finish
New powder-coated products may emit slight chemical odors for the first few uses as the cured resin stabilizes. This is temporary and not documented as harmful, but some users report a faint smell that dissipates with washing and airing.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Powder-coat composition (unspecified resins)
The exterior matte finish is not disclosed to contain BPA, phthalates, or heavy metals, and no recalls or complaints are on record. However, full formulation transparency is absent; the risk is theoretical and low given the non-contact application.
Stainless steel leaching (nickel, chromium)
Food-grade 18/8 stainless steel is designed to resist corrosion and does not leach metals into neutral beverages under standard use. Risk is negligible unless the canteen is damaged or exposed to prolonged contact with very acidic or salty liquids.
The full breakdown
What it's made of and why it matters
This canteen is constructed from food-grade stainless steel (typically 18/8) with a matte powder-coat finish applied to the exterior. The stainless steel core resists corrosion and does not leach metals into beverages under normal use. The powder coat is a dry, baked polymer finish not typically formulated with Teflon-type coating or heavy metals in the cookware/drinkware class, though the exact resin composition is not publicly disclosed by Corkcicle.
The brand's record and disclosure
Corkcicle does not publish detailed material safety data sheets or third-party testing certifications (e.g., NSF, FDA compliance statements) on their website. The brand has not faced documented safety recalls or public complaints tied to the canteen leaching or coating degradation. No formal PFAS commitment or testing transparency has been announced, but absence of evidence of a problem is not the same as a guarantee.
How it compares in its category
Stainless steel canteens are among the lowest-risk drinkware options compared to ceramic-glazed or plastic-lined alternatives. The matte powder coat is a cosmetic finish that does not contact contents directly, reducing contact hazard versus interior coatings. Other reputable brands in this space (Hydro Flask, S'well) similarly do not disclose powder-coat formulations, making Corkcicle's transparency consistent with category norms.
If you buy it
Hand wash rather than dishwasher to extend the powder coat's integrity and minimize any thermal stress on the finish. Do not fill with boiling water immediately after purchase; allow the product to reach room temperature first. Inspect the exterior annually for chips or peeling; if the coating compromises, replacement is prudent to prevent any microscopic resin particles entering liquids. Avoid abrasive scrubbing or acidic liquids sitting in contact for extended periods, as these can degrade the finish over years of use.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Corkcicle has made none
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Insulated Drink Tumblers
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Stainless steel body, powder-coat finish
Powder-coat finish degradation
Limited concern
Seal degradation and microbial growth
Limited concern
Thermal shock to seals
Limited concern
Brand PFAS statement on record, which we have not verified.
⚠Starting grade for this product type
Klean Kanteen
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Nickel leaching from stainless steel
Limited concern
Silicone lid degradation
Limited concern
Brand PFAS statement on record, which we have not verified.
⚠Starting grade for this product type
Klean Kanteen
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Powder-coat cap degradation over time
Limited concern
Bacterial biofilm in cap threads and seals
Limited concern
Thermal stress on seals at extreme temperatures
Limited concern
Brand PFAS statement on record, which we have not verified.
⚠Starting grade for this product type
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.