Mira · Portable Water Filtration Bottles
Mira Stainless Steel Vacuum Insulated Wide Mouth Water Bottle Thermos Keeps Cold for 24 hours
Lower PFAS risk. Stainless steel core with no surface treatments disclosed.
Mira's vacuum bottle appears to be stainless steel construction without reported PFAS-containing coatings. Brand makes no PFAS claims, but material composition suggests minimal fluorochemical exposure risk.
The safe swap
Mira
Mira Double Vacuum Insulated Stainless Steel Water Bottle
100/100 safety
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel body, interior vacuum insulation
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.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Mira bottle uses food-grade stainless steel as its primary barrier, which is chemically inert and does not leach metals or compounds into water under normal use. Vacuum insulation between double walls is typically achieved with air or inert gas, not chemical foam, reducing off-gassing risk. The interior surface is the critical contact layer; stainless steel does not require plastic liners, coatings, or epoxy resins that could degrade or release compounds over time. Cap and closure materials (likely plastic or elastomer) are the only potential exposure points for secondary contaminants.
The brand's record and disclosure
Mira maintains limited public disclosure on material sourcing, manufacturing standards, or third-party certifications for this product line. No recalls, litigation, or documented safety incidents involving Mira water bottles have been publicly reported. The brand does not appear to publish explicit PFAS statements or test reports for their vacuum bottles. Given the stainless steel construction, formal certification is less critical than it would be for coated or composite bottles, but transparency remains low.
How it compares in its category
Stainless steel vacuum bottles represent a lower-risk category compared to plastic bottles (BPA/BPS leaching risk with heat) or lined metal bottles with epoxy coatings (potential lead or cadmium in enamel). They avoid the microplastic shedding risk of some polymer insulation methods and eliminate the need for antimicrobial coatings. Mira's design is functionally comparable to established competitor products (e.g., Hydro Flask, S'well) at a lower price point, though without equivalent third-party testing or sustainability certifications.
If you buy it
Rinse thoroughly before first use to remove any manufacturing residue. Do not use in dishwashers if the manufacturer advises against it, as repeated high-heat cycles can degrade seals and caps. Inspect the rubber gasket or seal annually for cracking or discoloration; replace if degraded to prevent bacterial growth in the vacuum space. Keep the interior dry between uses and avoid storing liquids for extended periods (beyond 24-48 hours) to minimize microbial colonization.
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.”
Seal and gasket degradation (bacterial growth risk)
The rubber or silicone gasket in the cap can crack or degrade with age and repeated use, creating crevices where bacteria and mold may grow if water is stored long-term. This is a maintenance issue, not a manufacturing defect specific to Mira, but affects all double-wall vacuum bottles.
Cap and closure material leaching
The bottle's cap, lid seal, and any plastic components are not stainless steel and may be BPA-containing polycarbonate or recycled plastic. While contact time is brief during drinking, risk increases if hot liquids are stored with the cap on for extended periods.
Manufacturing residue or metallic particles
No specific recalls or reports of Mira bottles leaching stainless steel particles or containing machining debris. Standard for the material class; rinse before first use as routine precaution.
Vacuum seal compromise over time
Repeated pressure changes, impacts, or thermal cycling can gradually reduce the vacuum integrity, allowing air infiltration and condensation inside the insulation space. This does not pose a direct health hazard but may indicate seal failure that needs inspection.
Coating or enamel in interior or exterior finish
No powder coat, paint, or enamel finishes reported in the product specifications, eliminating lead, cadmium, or VOC off-gassing risks typical of coated metal bottles. Bare or brushed stainless steel is the stated construction.
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.
Safer alternatives in Portable Water Filtration Bottles
Mira
Double Vacuum Insulated Stainless Steel Water Bottle
stainless steel (bare, no known coatings)
Lower concern. Bare stainless steel has no typical PFAS use.
✓Bare metal or glass, no coating at all
Mira
Stainless Steel Vacuum Insulated Water Bottle Leak-proof Double Walled Cola Shape
Stainless steel double wall, no coating disclosed
Stainless steel bottle, lower PFAS concern, no coating risks identified
✓Bare metal or glass, no coating at all
Mira
17 Oz Stainless Steel Vacuum Insulated Water Bottle
Stainless steel interior and exterior, plastic lid/cap
Lower PFAS concern, standard vacuum bottle design
✓Bare metal or glass, no coating at all
More portable water filtration bottles 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.