Mira · Insulated Travel Drinkware
MiiR 360 Traveler
Lower concern, basic steel drinkware. No PFAS-risk features.
MiiR 360 Traveler is stainless steel with silicone grip, no nonstick or water-resistant coatings that typically contain PFAS. No public disclosure of PFAS testing.
Shop Mira on Amazon →Material
Stainless steel tumbler with silicone grip
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
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
The MiiR 360 Traveler is constructed from stainless steel (typically 18/8 or similar food-grade alloy), which is chemically inert and does not leach metals into beverages under normal use. The silicone grip is a polymer that softens the tumbler for handling; food-grade silicone, when properly manufactured, does not migrate harmful compounds into liquids. Stainless steel is among the safest drinkware materials because the chromium-nickel matrix resists corrosion and degradation, unlike ceramic glazes or non-stick coatings.
The brand's record and disclosure
MiiR (note: product lists 'MIRA' but the brand is MiiR) maintains a sustainability-focused public image and has published corporate responsibility statements, though detailed chemical safety disclosures are limited. No major recalls or contamination incidents are on record for this product line. The brand has not publicly committed to PFAS elimination in all manufacturing, which is typical of smaller drinkware manufacturers but represents a gap in transparency rather than evidence of risk in this specific item.
How it compares in its category
Stainless steel tumblers are considered a safer choice than plastic drinkware (which may contain BPA or phthalates) or glazed ceramic cups (which may have lead in enamels). Among steel tumblers, the MiiR 360 Traveler sits in the mid-to-premium segment; equivalent products from brands like Hydro Flask or YETI have comparable material safety profiles. The addition of a silicone grip is standard and does not materially increase hazard risk if the silicone is food-grade certified.
If you buy it
Wash the tumbler before first use and inspect the silicone grip for any manufacturing odors; these typically off-gas in the first few uses. Avoid prolonged exposure to extreme heat (above 140°F) or direct flame, as this may degrade the silicone. Stainless steel is durable; replace it only if the insulation layer fails (indicated by sweating on the exterior) or if the seal degrades. Hand-wash to preserve the finish; dishwasher use is generally safe but may dull the exterior over years of use.
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.”
Silicone grip degradation and leaching
Food-grade silicone used in this product type is not known to leach harmful compounds under normal beverage storage conditions. Risk is negligible if the silicone is certified food-safe, which is standard for reputable brands.
Stainless steel nickel leaching
Nickel content in 18/8 stainless steel can leach in trace amounts if the steel is scratched or exposed to highly acidic liquids over extended periods. For most users with typical beverages (water, coffee, tea), this poses no meaningful risk; individuals with nickel sensitivity may warrant caution.
Insulation layer integrity and failure
Double-wall stainless steel tumblers occasionally develop micro-tears in the seal between walls, allowing moisture to enter. This is a durability issue rather than a chemical hazard, but a compromised tumbler should be replaced.
Bacterial growth in seams and silicone
Stainless steel tumblers with silicone grips can harbor bacteria in crevices if not thoroughly cleaned after use. This is a hygiene issue managed by regular washing; no chemical contamination is inherent to the design.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% 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.