Cuppa · Insulated Drink Tumblers
Cupture Stainless Steel Skinny Insulated Tumbler Cup with Lid and Reusable Straw
Lower concern. Stainless steel tumbler with no known PFAS sources.
Stainless steel is inherently PFAS-free. Lid and seal materials (plastic, silicone) pose minimal risk unless treated with water-resistant coatings, which the brand does not disclose. No PFAS red flags identified.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel, plastic lid, silicone seal
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
The tumbler body is 18/8 or 304-grade stainless steel, a food-contact alloy that does not leach metals or degrade into consumables under normal use. The plastic lid and silicone seal are the only components that contact beverage over time; these are typically polypropylene (PP) or polyethylene (PE) for the lid and food-grade silicone for the seal. Stainless steel's closed, non-porous structure makes it chemically inert with hot or cold beverages, eliminating the leaching concerns that plague ceramic coatings, aluminum, or non-stick surfaces.
The brand's record and disclosure
Cuppa does not publicly disclose material certifications, manufacturing audits, or chemical safety testing on this product. No recalls, complaints, or safety controversies are on record for this specific tumbler model. The brand's silent stance on PFAS and material sourcing is typical of budget drinkware brands and does not indicate known problems, but also does not provide third-party verification of lid or seal composition. Independent testing or certifications (e.g., FDA food-contact compliance) are not advertised.
How it compares in its category
Insulated tumblers with stainless steel bodies are among the safest beverage containers available, avoiding the wear-and-tear hazards of ceramic-coated or non-stick alternatives. This product occupies the mid-to-budget tier; premium brands (Hydro Flask, Yeti) often provide material transparency and warranty clarity, while cheaper models sometimes use unclear plastic blends. Stainless steel itself carries no documented safety disadvantage versus copper or aluminum cores used in competitors, and the reusable straw sidesteps single-use plastic waste.
If you buy it
Hand-wash the lid and silicone seal monthly with warm soapy water and inspect for cracks, discoloration, or persistent odors, which signal seal degradation. Do not microwave the assembled tumbler or expose the lid and seal to boiling water for extended periods (above 80°C), as plastic components may warp or leach. Replace the silicone seal if it becomes dry, brittle, or develops a chemical smell. The stainless steel body itself is durable for years; monitor lid threads and seal compression for loss of insulation performance.
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 material migration
The polypropylene or polyethylene lid may leach minor nonvolatile compounds (oligomers, residual monomers) if exposed to prolonged heat or acidic beverages, though food-contact grades are designed to minimize this. Risk is low with normal cold or warm drink use.
Silicone seal degradation
Food-grade silicone can harden, crack, or develop odors after months of use, especially if exposed to hot water or acidic drinks; degraded seals may shed microparticles. Regular inspection and replacement every 12-24 months mitigates this.
Bacterial or mold growth in seal
The silicone seal's crevices and the lid's interior threading can trap moisture and harbor bacteria if not dried thoroughly after washing. This is a hygiene issue, not a chemical hazard, but relevant to safe daily use.
Stainless steel corrosion (lid/threaded interface)
The stainless steel body itself is resistant to corrosion; however, the lid-to-tumbler interface may corrode if saltwater, chlorine, or highly acidic liquids are stored long-term. Standard freshwater beverages pose no known risk.
Reusable straw material (if plastic or bamboo)
No material composition is specified for the included reusable straw; if it is BPA-free PP or stainless steel, risk is minimal. If bamboo composite, verify it is food-safe and free of adhesive binders; cleaning difficulty may promote microbial growth.
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.
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.