Corkcicle · Insulated Travel Drinkware
CORKCICLE TUMBLER
Lower concern. Stainless steel body, but plastic components unspecified.
Corkcicle tumblers use stainless steel construction, lower PFAS risk. Plastic lid and plug material unknown, not disclosed by brand.
Shop Corkcicle on Amazon →Material
Double-wall stainless steel with plastic lid/plug
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 Corkcicle Tumbler features a double-wall stainless steel core, which is chemically inert and does not leach metals or compounds into liquids under normal use. The lid and plug are plastic components, likely polypropylene or similar food-contact polymer, but they do not remain submerged and contact is brief and ambient-temperature. Double-wall construction also means the inner stainless steel wall is the only surface touching your beverage, insulating it from exterior degradation.
The brand's record and disclosure
Corkcicle does not publicly disclose PFAS testing results, use, or avoidance statements for this product line. The brand markets as a lifestyle drinkware company with emphasis on sustainability and design rather than toxicology transparency. No major recalls or safety controversies involving this specific tumbler model are on public record. The brand has not sought third-party safety certifications (e.g., FDA food-contact clearance statements) prominently.
How it compares in its category
Stainless steel tumblers are among the lowest-risk reusable drinkware options because the material itself does not leach. Corkcicle's double-wall design is standard for insulated tumblers and poses no added hazard. Competitors like Hydro Flask and S'well use similar stainless steel construction, so this product is materially comparable. The main variable across brands is plastic lid composition and PFAS treatment, which Corkcicle has not disclosed.
If you buy it
Wash the lid and plug by hand or on the top rack of the dishwasher to avoid plastic degradation; avoid prolonged boiling water contact with plastic parts. Do not fill with liquids hotter than 160F if you are concerned about leaching from the plastic seal, though stainless steel itself has no temperature limit. Replace the lid or plug if cracking, discoloration, or odor develops. Stainless steel body is durable and will not degrade with normal use or dishwashing.
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.”
Teflon-type coating or non-stick coating on stainless steel
Corkcicle does not market a non-stick coating on the tumbler interior. Standard stainless steel without additional surface treatment is used, so Teflon-type coating fume risk does not apply.
Plastic lid/plug composition and leaching
The material identity and manufacturing process of the plastic lid and plug are not disclosed. While brief ambient-temperature contact is low-risk, long-term storage of acidic beverages or warm liquids in contact with the seal could present minor leaching risk if low-quality or recycled polymer is used.
BPA or phthalates in plastic components
Corkcicle does not explicitly state that lids and plugs are BPA-free or phthalate-free. However, FDA regulations restrict BPA in food-contact plastics, and modern food-grade polypropylene typically avoids phthalates; no reported contamination cases for this product exist.
Stainless steel nickel/chromium leaching
Stainless steel is passivated and does not leach nickel or chromium into neutral or acidic beverages under normal conditions. Double-wall construction further isolates the inner surface from wear. No leaching has been reported for this product type.
Bacterial growth in double-wall seal or drainage holes
If the tumbler has a drainage port or the seal becomes compromised, water or beverage residue can accumulate in the gap between walls, promoting mold or bacterial growth. Regular inspection and thorough drying after washing will mitigate this risk.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% 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.