Mira · Insulated Drink Tumblers
Mira Stainless Steel Vacuum Insulated Tumbler Flip Lid
Lower concern. Stainless steel body has no coating on record.
The stainless steel body is not a material linked to PFAS and has no surface coating on record. The polymer flip lid material and any treatments are not disclosed by the brand.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, polymer flip lid
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Mira Stainless Steel Vacuum Insulated is made of, ingredients and materials
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.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
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.
Microplastics
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.
Source, EPA ↗What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
BPA & bisphenols
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.
Source, FDA ↗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
Food-grade stainless steel (304/18-8) is engineered to resist corrosion and elemental leaching across acidic pH ranges used for food contact. Acute leaching into water or typical beverages is not a recognized hazard with stainless steel drinkware.
Source, FDA ↗The full breakdown
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 (not a material linked to PFAS) 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 lower concern 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.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Mira has made none
Formulations change between production runs, so check the current label. How we grade.
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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.