Cuppy · Insulated Travel Drinkware
Hydro Flask All Around Travel Tumbler
Stainless steel tumbler, lower concern. No PFAS disclosure needed.
Hydro Flask-style tumblers are typically stainless steel with vacuum insulation, materials without inherent PFAS use. Brand makes no PFAS claims; standard insulated drinkware poses minimal PFAS risk.
Shop Cuppy on Amazon →Material
Stainless steel with vacuum insulation
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
This tumbler uses food-grade stainless steel (typically 18/8 or 304 grade) as the inner and outer walls, with a vacuum-sealed air gap between them for insulation. Stainless steel does not leach metals into beverages under normal use because the chromium oxide passivation layer prevents corrosion. The lid and sealing gaskets are the only non-metal components; if they are silicone or rubber, they do not typically release harmful chemicals at room or warm beverage temperatures.
The brand's record and disclosure
Cuppy (the brand listed) has no widely documented safety recalls or hazard disclosures for this product as of available public records. The brand does not make explicit PFAS or manufacturing-process transparency claims in standard marketing materials, which is typical for small housewares brands. No third-party certifications (NSF, FDA compliance statements) are routinely advertised for this model, but stainless steel tumblers are low-risk products by material class alone.
How it compares in its category
Stainless steel insulated tumblers are among the safest reusable beverage containers available; they avoid the coating-degradation risks of non-stick cookware and BPA concerns of plastic cups. Competitors like Hydro Flask (the product name referenced) and S'well use identical materials and construction, making this a commodity category where material choice matters far more than brand differentiation. Vacuum insulation quality and lid seal integrity vary by manufacturing precision, but do not introduce new chemical hazards.
If you buy it
Hand-wash the tumbler and lid separately to avoid damaging gaskets in the dishwasher; replace rubber or silicone seals if they become visibly cracked or lose elasticity (typically 2-3 years of heavy use). Do not leave hot beverages sealed for extended periods, as pressure buildup can compromise the lid seal. Avoid acidic beverages (vinegar, lemon water) sitting for days, as even stainless steel can show minor surface discoloration over time with prolonged contact.
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.”
Lid and gasket material (BPA, phthalates, or degradation)
If gaskets are silicone or food-grade rubber, neither BPA nor phthalates are expected. No recalls or reports of leaching from Cuppy tumbler lids are documented. Degradation risk is mechanical (cracking) rather than chemical.
Stainless steel corrosion and metal leaching
Food-grade stainless steel (304) is highly corrosion-resistant under normal beverage use. Leaching of nickel or chromium is not a documented concern for this product class unless the steel is damaged or counterfeit.
Coating or adhesive off-gassing
Vacuum-insulated tumblers do not use interior coatings like Teflon-type coating or epoxy. The exterior may have a powder coat or paint, but this does not contact beverages and poses no inhalation risk during use.
Microplastic shedding from cap or seals
If the lid is plastic or contains plastic components, wear or grinding over years of use could theoretically shed microparticles. Evidence for this product specifically is absent, but replacement gaskets every 2-3 years mitigates the theoretical risk.
Bacterial growth in insulation cavity or lid crevices
The vacuum seal is airtight and does not support bacterial growth. However, poor cleaning of the threaded lid or gasket crevices before sealing could trap moisture. Dry thoroughly after washing to prevent mold or odors.
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.