S'well · Portable Water Filtration Bottles
S'well Water Bottle 17oz Pink Topaz
Lower PFAS concern, but brand discloses nothing about materials.
S'well's stainless steel construction is inherently lower risk for PFAS. No public disclosure of manufacturing details or PFAS testing by the brand limits full confidence.
Shop S'well on Amazon →Material
Stainless steel double wall with vacuum insulation
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).
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
S'well's 17oz bottle uses 18/8 food-grade stainless steel (18% chromium, 8% nickel) in a double-wall vacuum-insulated design with a plastic cap. Stainless steel is chemically stable across normal temperature ranges and does not leach metals into water under typical use. The vacuum insulation contains no refrigerant or propellant, eliminating off-gassing risk. The plastic cap is the only potential weak point for chemical leaching.
The brand's record and disclosure
S'well does not publicly disclose detailed material sourcing, manufacturing standards, or third-party testing results on their website. The company has not published statements on PFAS use in coatings, linings, or components. No major recalls or safety controversies involving S'well bottles have been reported in public databases. The brand markets durability and sustainability but provides minimal transparency on chemical composition or hazard mitigation.
How it compares in its category
Metal water bottles (stainless steel) are among the safest reusable beverage containers because the material itself does not leach. Compared to plastic bottles, S'well eliminates BPA and phthalate exposure. Compared to ceramic or coated aluminum bottles, stainless steel avoids concerns about glaze contaminants or protective coatings degrading. Price is higher than plastic alternatives but typical for premium metal bottles.
If you buy it
Hand-wash the bottle and cap with mild soap to prevent plastic cap degradation from dishwasher heat. Avoid prolonged contact with acidic beverages (lemon water, vinegar) which may slowly corrode stainless steel over years. Inspect the cap periodically for cracking or discoloration; replace if visible wear develops. The stainless steel body does not require replacement under normal use and poses no expiration risk.
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.”
Plastic cap leaching (BPA/phthalates)
The bottle cap is made of plastic, and S'well does not publicly specify the resin type or whether BPA/BPS alternatives are used. Risk is low if cap does not contact hot liquids frequently, but prolonged dishwasher exposure or hot beverage storage could increase leaching potential.
Nickel leaching from stainless steel
18/8 stainless steel is stable in neutral to slightly acidic water under normal conditions. No documented cases of nickel leaching from S'well bottles have been reported. Risk is minimal unless the bottle is regularly filled with highly acidic beverages (pH below 3.5).
Bacterial growth in insulation chamber
The sealed vacuum space is not accessible for cleaning and cannot harbor bacteria since it contains no air or moisture. This design eliminates a common risk in some insulated bottles with exposed internal cavities.
Coating or adhesive off-gassing
S'well bottles use no internal epoxy lining or adhesive-applied coating; the stainless steel is bare metal. No chemical off-gassing or VOC emissions have been documented for this product class.
Paint or printed label toxicity
The exterior coloring (Pink Topaz) appears to be a powder-coat or anodized finish on the steel; no peeling paint hazard has been reported for S'well bottles. Print on labels is minimal risk if not ingested.
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.
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
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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.