Corkcicle · Insulated Drink Tumblers
Corkcicle Sport Canteen
Lower concern. Stainless steel with non-Teflon-type coating insulation and no coating on record.
The Sport Canteen is made of stainless steel with non-Teflon-type coating insulation. The brand has no PFAS statement on record. Stainless steel is not a material linked to PFAS.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel with non-Teflon-type coating insulation
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.
Insulation material off-gassing (VOCs)
Closed-cell foam or polyurethane insulation can release trace volatile organic compounds during manufacturing or initial use. No specific off-gassing data for Corkcicle products is publicly available; exposure is minimal once sealed and cured, and risk is lower than for open-cell foams.
Cap or lid seal material degradation
Non-stainless-steel components (silicone gaskets, plastic seals) may degrade or harbor bacteria if not cleaned regularly. This is a maintenance issue rather than a toxicity hazard, but repeated hot-water washes can shorten seal lifespan.
Bacterial growth in insulation or seams
If the seal deteriorates or liquid seeps into the insulation layer, stagnant moisture can support mold or bacteria growth. This is a maintenance and design risk, not a chemical hazard; prevent by proper cleaning and drying.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Heavy metals
Food-grade 304 stainless steel used in reputable drinkware does not contain added cadmium or lead. Welded seams meet FDA standards for food contact. No recalls or test reports suggesting leaching from this product.
Source, FDA ↗The full breakdown
What it's made of and why it matters
The Corkcicle Sport Canteen uses food-grade stainless steel (typically 18/8 or 304 grade) for the outer and inner walls, which is chemically inert and does not leach heavy metals or BPA into beverages. The insulation layer between the walls is a standard closed-cell foam or polyurethane material (non-Teflon-type coating, per specification), which is sealed and does not contact the liquid you drink. Stainless steel is linked to lower concern because it resists corrosion, does not degrade with acidic or hot liquids, and has no hazard of this kind on record.
The brand's record and disclosure
Corkcicle has not published detailed material safety data sheets or certifications (BPA-free claims, FDA compliance statements) in widely accessible public sources, though the company markets products as suitable for food and beverage use. No major recalls or safety controversies involving this product line have been documented in public safety databases. The brand's silence on PFAS use in insulation foaming or manufacturing is typical of the drinkware industry, where disclosure remains voluntary and inconsistent.
How it compares in its category
The Sport Canteen is comparable to Hydro Flask, S'well, and Klean Kanteen in material safety; all use stainless steel construction and closed-cell insulation. Unlike some budget drinkware, there is no reported lead in seams or enameled coatings. The main differentiator is aesthetic and durability, not chemical safety; the non-Teflon-type coating insulation is a minor positive versus older nonstick-foam designs, though the practical safety gain is marginal since insulation is not in contact with contents.
If you buy it
Wash by hand or in the top rack of a dishwasher to preserve the exterior coating; avoid prolonged exposure to extreme heat (do not autoclave or use in an oven). Stainless steel is durable and will not leach under normal use; you do not need to replace it unless dents or the seal fail. Do not submerge the cap or lid seals for extended periods, as non-metal components may degrade over years. Avoid abrasive scrubbers that may scratch the stainless steel surface, though scratches do not create safety risks.
What we don’t know
- Basis
- Model estimate, 78% 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.