MiiR · Insulated Drink Tumblers
Vacuum Insulated Wine Tumbler 10 oz
Lower concern tumbler, but lid coating unspecified; check current MiiR materials
MiiR vacuum tumblers typically use stainless steel and closed-cell foam insulation, both lower concern. Lid material and any coating remain undisclosed; contact MiiR directly for specifics.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel interior, vacuum insulation, unspecified lid/exterior coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Vacuum Insulated Wine Tumbler 10 oz is made of, ingredients and materials
The interior is stainless steel (typically 18/8 or 18/10 grade), which does not leach into beverages under normal use and resists corrosion. The vacuum insulation layer is an air gap between the inner and outer walls, a purely physical barrier with no chemical leaching pathway. The lid and exterior coating are not specified in available product information, which is the main gap in this assessment. Stainless steel itself has no known hazard profile for beverage contact.
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 coating or sealant composition (unspecified)
The exterior coating and lid material are not specified in available product information. Potential concern depends on whether the lid is plastic (possible BPA/phthalates if not food-grade), elastomer (potential heavy metals in pigments or formaldehyde resins in synthetic rubber), or stainless steel. Direct inquiry with MiiR is necessary to rule out concern.
Vacuum seal degradation and microbial growth
If the rubber gasket or seal degrades over time or is not fully sealed, moisture can enter the vacuum insulation layer, creating a warm, enclosed environment where bacteria or mold may grow. This is a mechanical failure mode, not a chemical hazard, but maintenance and replacement of worn seals prevents it.
Microplastic shedding from lid or cap
If the lid or closure is plastic and subject to repeated opening, closing, or temperature cycling, microscopic degradation is theoretically possible. No published testing of MiiR lids for microplastic release exists. Plastic lid selection and care (avoiding dishwasher if possible) reduce this risk.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel leaching (general)
Food-grade stainless steel (18/8 or higher nickel content) does not leach under normal beverage use. Concern is only present if steel is substandard (rare in this price category) or if acidic/hot beverages exceed design limits. No reports of leaching from MiiR tumblers are on record.
Thermal injury from insulation performance
Vacuum insulation keeps the exterior cool even when holding hot beverages, which may mask the temperature of the contents. No burn reports are on record, but users should verify beverage temperature before drinking, especially when serving to children.
How is this PFAS grade calculated?
The brand's record and disclosure
MiiR is a B-Corp certified brand known for sustainability and transparency initiatives, though detailed material disclosure on individual products (especially lid composition) is not consistently published. The brand has not issued voluntary material safety statements or third-party test reports for this tumbler model that are publicly available. No major recalls or contamination incidents specific to this product or brand are on record. The 'Excellent' PFAS grade reflects likely low use of aqueous film-forming compounds, but the silent stance on PFAS ingredients means the brand has not proactively disclosed avoidance commitments.
How it compares in its category
Vacuum-insulated tumblers in this category typically use stainless steel bodies (a lower-concern choice) and vary widely in lid materials, ranging from plastic to silicone to stainless steel. MiiR's reputation for quality manufacturing and material choice places it in the middle-to-upper range of the category. Many competitors in this price segment offer less transparency about lid coatings and external finishes. The lack of published durability testing or warranty specifics is typical but not a differentiator.
If you buy it
Contact MiiR directly to confirm the lid material and any coatings or seals before use; this tumbler will not leach from the stainless steel interior under normal serving (cold to warm beverages). Do not microwave the assembled tumbler, as vacuum insulation is not microwave-safe. Hand wash rather than dishwasher if the lid contains rubber or silicone, as high heat may degrade seals over time. Replace the lid gasket or seals if they show wear, cracking, or discoloration, as degradation can allow bacterial growth inside the vacuum layer.
What is not known about PFAS in this product?
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- MiiR has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Vacuum Insulated Wine Tumbler 10 oz?
- 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, all on its full breakdown.
- 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, all on its full breakdown.
- 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, all on its full breakdown.
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.