MiiR · Insulated Drink Tumblers
REI Co-op MiiR 360 Traveler - 20 fl. oz. Pink
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes stainless steel with powder-coated finish, with no water-repellent coating named. Water resistance on products like this usually comes from the material and its seals rather than a surface treatment. The brand has published no PFAS statement for it.
The better-graded swap
Zojirushi
Stainless Steel Travel Mug Zojirushi
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 with powder-coated finish
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What REI Co-op MiiR 360 Traveler fl. oz. Pink is made of, ingredients and materials
The MiiR 360 Traveler is constructed from food-grade stainless steel (grade not specified in public materials, but typical for this price tier is 18/8 or 304). The exterior features a powder-coated finish in the pink colorway, which provides durability and thermal insulation. Stainless steel does not leach metals under normal drinking conditions, and powder coat is a thermoset polymer applied electrostatically to the metal surface. The lid and seals are typically silicone or polypropylene based on MiiR's standard designs, though REI Co-op labeling does not detail these components.
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.
Powder-coat durability and adhesion
REI Co-op product pages do not specify powder-coat adhesion standards or chip resistance testing. Minor flaking or chipping is cosmetic risk, not toxicological, but REI does not publish failure data for this model.
Polymer components (lid, seals) unspecified
The lid and gasket materials are not detailed in publicly available product descriptions. Typical MiiR designs use silicone and polypropylene, which carry low contamination risk, but BPA or phthalates in cheaper aftermarket seals are a replacement concern if the original fails.
Seal degradation and bacterial growth
Silicone or rubber gaskets can trap moisture and harbor mold if not fully dried after washing. This is a maintenance issue, not a manufacturing defect, but MiiR's care instructions are not detailed in standard retailer listings.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Lead
Food-grade stainless steel does not intentionally contain lead or cadmium. No recalls or test failures are on record for MiiR stainless tumblers in this regard.
Source, ATSDR ↗Stainless steel leaching under acidic conditions
High-grade stainless steel (18/8) is resistant to corrosion from acidic beverages (coffee, citrus, soda). Nickel migration is theoretically possible but negligible in short-term use and absent in published toxicology for food-contact stainless.
How is this PFAS grade calculated?
The brand's record and disclosure
MiiR is a smaller outdoor/lifestyle brand without prominent third-party certifications (NSF, FDA facility registration, etc.) visible in public records. The brand has not issued a public PFAS statement or full material safety disclosure, which is typical for mid-market drinkware makers but leaves polymer components unverified. No recalls, heavy metal findings, or toxicology controversies are on record for MiiR drinkware. REI Co-op carries many vetted brands but does not impose stricter chemical standards than federal baseline.
How it compares in its category
Insulated stainless steel tumblers are among the lowest-risk drinkware options because the drinking surface is steel, not ceramic or plastic. Unlike ceramic-lined or painted metal tumblers, the MiiR avoids lead/cadmium glaze risk. Compared to cheaper polymer-only or aluminum-only tumbler alternatives, stainless steel + powder coat is durable and does not degrade into the liquid. Some premium competitors (e.g., Hydro Flask, YETI) publish more detailed material specs and third-party testing, but functional safety is comparable across this segment.
If you buy it
Hand wash the exterior and interior separately; avoid dishwasher for the lid and seals to prevent silicone degradation. Do not fill with extremely hot liquids (above 160F) immediately after manufacture, as thermal stress on the powder coat is rare but possible. Replace the lid or seal gasket if visible cracks or cloudiness appear. The powder coating is durable but will eventually chip with heavy use; chips do not affect drinkability but expose bare steel, which may rust if moisture penetrates the coat.
What is not known about PFAS in this product?
- Basis
- Model estimate, 62% 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 REI Co-op MiiR 360 Traveler - 20 fl. oz. Pink?
- 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.