Mira · Insulated Travel Drinkware
Mira Insulated Wall Vacuum Stainless Steel Water Bottle Tumbler 17oz
Lower concern. Bare stainless steel tumbler with no reported PFAS risk.
Vacuum-insulated stainless steel water bottle with no known Teflon-family coating coatings or nonstick surfaces. MIRA does not disclose PFAS information, but the core material presents lower PFAS concern.
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Material
Stainless steel interior, vacuum-insulated double-wall construction
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Stain-resistant finish
Stain-resistant finishes are a common PFAS use.
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 18/8 food-grade stainless steel (18% chromium, 8% nickel) for the interior and vacuum-insulated double-wall construction with an air gap between layers. Stainless steel is chemically inert when properly manufactured and does not leach metal ions into beverages under normal use. The lid and any seals are the potential weak points for off-gassing or leachables, but stainless steel itself poses negligible risk of cadmium, lead, or aluminum leaching.
The brand's record and disclosure
MIRA does not publish detailed material sourcing or third-party safety certifications on their website. The brand has not publicly disclosed PFAS testing or manufacturing standards, though no recalls or safety complaints are on record for this specific tumbler model. MIRA operates in a crowded drinkware category with minimal transparency; lack of proactive disclosure does not indicate a problem but suggests limited consumer accountability infrastructure.
How it compares in its category
Insulated stainless steel tumblers are considered one of the safest drinkware options because the material does not require chemical coatings or liners prone to degradation. This product is comparable to higher-priced brands like Hydro Flask or YETI in core material safety; the main differentiator is warranty and build quality, not hazard profile. Plastic-lined or ceramic-coated alternatives carry higher leaching risk.
If you buy it
Hand wash the lid and silicone gasket separately to prevent mold or bacterial growth in tight seams; dishwasher is typically safe for the steel body. Avoid leaving acidic beverages (citrus, vinegar) sitting for extended periods, as even stainless steel can develop minor corrosion over years if the protective oxide layer is compromised. Replace the lid gasket if it cracks or discolors. The vacuum seal will gradually weaken over 2-5 years; this is normal wear, not a safety issue.
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/gasket material degradation or off-gassing
The lid is not specified as stainless steel and likely contains plastic or rubber. Silicone gaskets can off-gas volatile compounds at high temperatures or degrade over time, though risk is low with intermittent use.
Nickel leaching (from stainless steel)
18/8 stainless steel releases negligible nickel under normal beverage contact. Leaching only becomes a concern with prolonged acidic liquid storage or damage to the steel surface.
Bacterial or mold growth in seams
The vacuum seal and lid gasket create narrow spaces where bacteria or mold can grow if not dried thoroughly after washing. This is a use and maintenance issue, not a manufacturing defect.
Coating breakdown on exterior
No external coating is mentioned; if the exterior finish is painted or powder-coated, it could degrade over time, but this does not affect liquid contact surfaces.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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.