Corkcicle · Insulated Drink Tumblers
Leakproof Cruiser Insulated Tumbler with Handle
Low concern. Stainless steel and silicone avoid Teflon-family coating risk.
Corkcicle's stainless steel tumbler with silicone gasket avoids materials known for PFAS. The brand has not released PFAS information, and the design lacks typical Teflon-family coating coatings.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, silicone gasket
Brand disclosure
Brand is silent on PFAS
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.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Silicone gasket degradation and bacterial growth
If the silicone gasket is not removed and dried after each use, or if stored damp, mold or bacteria can colonize the seal. This is a hygiene risk rather than a chemical toxicity risk, but is the most common maintenance failure point for tumblers with silicone seals.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel corrosion and surface leaching
Food-grade stainless steel (typically 18/8 or 18/10 alloy) does not leach nickel, chromium, or other metals under normal drinking use. Prolonged exposure to highly acidic or salty conditions can initiate surface corrosion, but leaching into beverage is not established as a hazard at typical exposure levels.
Insulation material (foam or air-gap) off-gassing
Corkcicle does not publicly disclose the insulation composition (typical options are closed-cell foam or vacuum-sealed air). No volatile organic compound (VOC) or formaldehyde off-gassing has been reported for this model. The insulation does not contact the beverage and poses minimal inhalation exposure risk.
Heavy metals
If the lid includes a painted logo or metallic coating, there is a theoretical risk of lead or cadmium in paint, though this is not specific to Corkcicle and has not been documented as a problem. The plastic or powder-coated lid should not contact the beverage directly.
Source, FDA ↗The full breakdown
What it's made of and why it matters
The Corkcicle Cruiser uses a stainless steel outer body, which is chemically inert and does not leach metals under normal use conditions. The silicone gasket (lid seal) is a food-grade elastomer that does not contain BPA, BPS, or phthalates in typical formulations. Stainless steel and silicone are materials not linked to PFAS concerns and do not require surface coatings that might degrade or release toxins over time.
The brand's record and disclosure
Corkcicle has not publicly disclosed detailed chemical testing or third-party certifications for heavy metals or migration limits on this specific product. The brand maintains silent stance on PFAS, which is typical for tumbler manufacturers but limits transparency. No recalls specific to this model have been documented in public safety databases; the brand's general reputation centers on design and insulation performance rather than chemical safety communication.
How it compares in its category
Insulated tumblers made from stainless steel represent a lower-risk category compared to plastic-lined or ceramic-lined alternatives, which carry potential BPA, microplastic, or glaze-contamination concerns. Corkcicle's stainless steel construction is comparable to hydro-flask and yeti models in material safety profile. The silicone gasket is standard across premium tumblers and poses no known risks when kept clean and replaced if visibly degraded.
If you buy it
Hand wash the silicone gasket regularly to prevent bacterial biofilm buildup in the seal; do not place in the dishwasher if the manufacturer advises against it, as high heat and detergent can accelerate gasket aging. Replace the gasket every 1-2 years if it becomes sticky, discolored, or develops odor. Avoid prolonged storage of acidic beverages (citrus, vinegar) in direct contact with the stainless steel, as salt and acid can initiate corrosion over many months. Do not use abrasive scrubbers on the interior, as this does not damage safety but can leave residue.
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
Klean Kanteen
16oz Rise Tumbler
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
Rise Tumbler
18/8 stainless steel body, likely stainless steel or silicone lid
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
20oz TKWide with Café Cap, Tofu
Stainless steel bottle, stainless steel cap
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.