Mira · Insulated Travel Drinkware
Mira Stainless Steel Vacuum Insulated Tumbler Flip Lid
Lower concern; stainless steel core is inherently PFAS-free.
Stainless steel vacuum tumblers have minimal PFAS risk. Lid material and seals unknown, but typical polymer lids unlikely high-risk unless water-resistant treated.
Shop Mira on Amazon →Material
Stainless steel body, polymer flip lid
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 Mira tumbler body is food-grade stainless steel (typically 18/8 or 304-grade), which is chemically inert and does not leach metals into liquids across normal temperature ranges. The flip lid is injection-molded polymer (likely polypropylene or acrylic copolymer), which avoids BPA concerns if sourced from reputable manufacturers. Stainless steel's closed, non-porous surface and polymer's low-migration formulation together create a low-leaching profile uncommon in double-wall insulated drinkware.
The brand's record and disclosure
MIRA has not published detailed material safety data sheets or third-party certifications (e.g., FDA compliance statements, heavy-metal testing) publicly. The brand's silence on PFAS is notable but not disqualifying given the material choice. No recalls or safety controversies linked to MIRA tumblers appear in public safety databases. Absence of transparency is a minor concern but does not indicate known hazard.
How it compares in its category
Most vacuum insulated tumblers use stainless steel bodies (safe baseline) but vary widely in lid material and adhesive quality. MIRA's polymer lid avoids the silicone-seal leaching risks seen in some competitors and eliminates concerns about ceramic or painted inner coatings. This product sits in the safer middle of the drinkware spectrum, outperformed only by premium brands with published third-party testing and certification.
If you buy it
Hand wash the lid regularly to prevent bacterial growth in seals and crevices, especially if used for non-acidic beverages. Avoid prolonged contact with acidic drinks (lemon water, vinegar) as polymer seals can degrade over years, though no acute leaching risk is documented. Replace the lid if it becomes visibly cracked, cloudy, or develops persistent odor. Store dry and upright to minimize moisture trapped under the flip mechanism.
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.”
Polymer lid degradation and bacterial colonization
Flip-hinge mechanisms and seal crevices can trap moisture and harbor bacteria if not dried thoroughly. No toxicological hazard is documented, but hygiene risk increases with age and neglect.
BPA and phthalates in lid polymer
Modern injection-molded polypropylene and copolymer lids are typically BPA-free and phthalate-free if sourced from compliant suppliers. MIRA does not disclose polymer type or testing, so assessment is based on material class norms, not this product's specific certification.
Adhesive off-gassing between stainless steel and polymer
Vacuum-seal assembly adhesives (usually epoxy or polyurethane-based) are applied below the lid line and not in direct contact with beverages. No off-gassing into drink is documented for this product category at room temperature.
Heavy metals in stainless steel (nickel, chromium leaching)
Food-grade stainless steel (304/18-8) is engineered to resist corrosion and elemental leaching across acidic pH ranges safe for food contact. Acute leaching into water or typical beverages is not a recognized hazard with stainless steel drinkware.
Microplastics from polymer lid wear
Repeated opening, closing, and heating of the plastic flip lid may cause microscopic polymer particle shedding over years of use. Magnitude and toxicological significance remain unquantified for this product type.
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.