Mira · Insulated Drink Tumblers
Mira Insulated Wall Vacuum Stainless Steel Water Bottle Tumbler 17oz
Low concern. Bare stainless steel tumbler has no reported PFAS risk.
This vacuum-insulated stainless steel bottle lacks known Teflon-family coating coatings or nonstick surfaces. MIRA hasn't disclosed PFAS information, though the core material poses lower concern.
The better-graded swap
Zojirushi
Zojirushi Stainless Cool Bottle
80/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel interior, vacuum-insulated double-wall construction
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Mira Insulated Wall Vacuum Stainless is made of, ingredients and materials
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.
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.
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.
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.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
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.
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.
The full breakdown
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 present lower concern as drinkware 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 appropriate 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.
What we don’t know
- Basis
- Model estimate, 78% 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.
Better-graded alternatives in Insulated Drink Tumblers
Klean Kanteen
20oz TKWide with Café Cap, Tofu
- Stainless steel bottle, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Powder-coat cap degradation over time
3 hazards checked on this product. See all of them.
Klean Kanteen
16oz Rise Tumbler
- Stainless steel body, powder-coat finish
- The brand calls it PFAS-free, which we have not verified
- Powder-coat finish degradation
3 hazards checked on this product. See all of them.
Klean Kanteen
Insulated TKWide Cap
- Stainless steel bottle, plastic cap and silicone gasket
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation and leaching
3 hazards checked on this product. See all of them.
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.