Cuppa · Insulated Drink Tumblers
Igloo 20 oz Stainless Steel Tumbler
Lower concern. Bare stainless steel tumblers rarely contain PFAS.
Stainless steel drink tumblers are inherently PFAS-free materials with no Teflon-family coating or water-repellent coating. No PFAS issues typical for this product type.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, no nonstick or Teflon-family coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
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
This tumbler is constructed from stainless steel with no nonstick Teflon-family coating, ceramic, or enamel coating, which removes the risk of coating degradation and leaching. Stainless steel is a passive alloy (typically 300-series iron-chromium-nickel) that resists corrosion by forming a protective oxide layer and does not leach metals into beverage contents under normal use. The interior and exterior contact only with liquids or air, not foods that would stress the material chemically.
The brand's record and disclosure
Cuppa has no public record of safety certifications, third-party testing disclosures, or controversies involving this product line. The brand maintains silence on PFAS or materials sourcing, which is typical for small-to-mid-tier drinkware manufacturers and does not indicate a problem. No recalls or complaints specific to this model have been documented in public databases.
How it compares in its category
Uncoated stainless steel tumblers are among the safest drinkware options because they eliminate coating-failure and Teflon-family coating-fume hazards that affect nonstick or enameled alternatives. Double-wall insulated tumblers of this type commonly use stainless steel shells with air or foam insulation and plastic lids, which is a proven design with minimal chemical hazards if the lid is detachable and inspected for degradation. This product sits in the lower-risk segment of the tumbler market.
If you buy it
Wash by hand or in a dishwasher (stainless steel tolerates both). Inspect the lid (likely plastic) periodically for cracks or discoloration; replace it if it shows wear or develops odor. Avoid prolonged storage of acidic beverages (vinegar, citrus juice) or salt water, which can eventually pit stainless steel, though this is rare in 20 oz short-term use. The tumbler is suitable for hot and cold beverages within normal serving temperatures.
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.”
Plastic lid leachables
The lid is not specified by material in available information. If it is polypropylene or polystyrene, no hazard is typical; if it is polycarbonate or unclear, low risk of BPA leaching under cold or cool beverage use. Inspect for discoloration or odor before each use.
Stainless steel corrosion and pitting
Under normal use (drinking water, coffee, tea), 300-series stainless steel does not corrode or pit. Risk is negligible unless the tumbler is exposed to prolonged saltwater immersion or high-acidity solutions, which is not typical for a beverage container.
Coating degradation
This product has no nonstick or enamel coating, so coating failure, flaking, or fume release cannot occur. This is a material-design strength of bare stainless steel tumblers.
Thermal safety
Stainless steel is thermally stable and does not release volatile compounds when heated. The insulated air gap does not interact with beverage contents and poses no chemical hazard.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 85% 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.
Safer alternatives in Insulated Drink Tumblers
Reduce
Halo Tumbler
Stainless steel and plastic lid
Lower concern tumbler; stainless steel is inherently PFAS-safe.
✓Naturally PFAS-free material
Cuppa
To Go Tumbler
Stainless steel with plastic lid
Lower concern. Standard tumbler with no known PFAS risks.
✓Naturally PFAS-free material
Klean Kanteen
Steel Pint
18/8 stainless steel, bare metal
Lower PFAS concern. Bare stainless steel container, no coatings.
✓Bare metal or glass, no coating at all
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.