S'well · Insulated Travel Drinkware
S'well Recycled Stainless Steel Explorer 32oz Onyx
Lower concern. Bare stainless steel has minimal PFAS risk.
S'well's recycled stainless steel bottle is bare metal with no reported surface treatments or coatings. No PFAS-specific claims or certifications, but the material itself poses lower PFAS risk.
Shop S'well on Amazon →Material
recycled stainless steel, no known coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
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
This bottle is constructed from recycled stainless steel (grade not publicly specified, but S'well typically uses 18/8 or similar food-grade alloys) with no applied interior coating or enamel. Bare stainless steel is chemically stable and does not leach metal ions into room-temperature beverages in meaningful amounts. The recycled content adds environmental value but does not alter the safety profile compared to virgin stainless steel.
The brand's record and disclosure
S'well does not publish detailed material disclosures or third-party certifications (BPA-free claims, lead testing, etc.) on their website, and the brand has made no public commitment to PFAS avoidance or testing. This silence is not unusual for drinkware makers, but it means independent verification of heavy metal content or manufacturing process controls is unavailable. No recalls or safety controversies have been established in public records for S'well stainless steel bottles.
How it compares in its category
Bare stainless steel is one of the safest drinkware materials available and avoids the coating-degradation and microplastic risks of plastic bottles and the potential leaching issues of some ceramic or enameled alternatives. S'well's premium positioning and recycled material marketing are consistent with market leaders like Hydro Flask and Klean Kanteen, which also offer uncoated stainless options without extensive third-party safety disclosure.
If you buy it
Hand wash or use a bottle brush to avoid abrasive dishwasher damage to the exterior finish; stainless steel is durable enough for everyday use and unlikely to degrade in normal conditions. Avoid prolonged contact with acidic beverages (lemon juice, vinegar) if concerned about minor surface oxidation, though this does not pose a health risk. The bottle should last many years; replace only if the seal degrades or visible damage occurs.
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.”
Heavy metal leaching (lead, cadmium, chromium)
Bare stainless steel does not leach significant amounts of heavy metals into cold or room-temperature beverages. S'well has not published independent testing for lead or cadmium content, but the material class itself carries minimal risk at rest.
Coating degradation and microplastics
This product has no interior coating (polymer, enamel, or ceramic), eliminating the risk of coating flaking or microplastic release. This is a material advantage over many insulated bottles.
Seal and gasket off-gassing (rubber or silicone)
The lid seal and gasket composition is not disclosed; typical S'well lids use food-grade silicone or rubber, which are generally safe but not formally certified by S'well. Minor VOC off-gassing from new seals is possible but dissipates quickly with use.
Nickel sensitivity from stainless steel contact
Stainless steel contains nickel (typically 8-12% in 18/8 alloy). Individuals with severe nickel allergy may experience skin irritation on lips during drinking, though systemic nickel ingestion from water contact is negligible. This is an edge case and not a concern for most users.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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 Insulated Travel Drinkware
Ember
Cold Tumbler
stainless steel with silicone seal
Lower concern; stainless steel tumbler unlikely to contain PFAS.
✓Naturally PFAS-free material
Ember
Tumblers - Set of 4
Stainless steel double-wall insulated
Lower PFAS concern; stainless steel drinkware rarely treated.
✓Naturally PFAS-free material
Ember
Cup 14 oz Slate Black
Ceramic or ceramic-coated stainless steel with heated base
Lower concern. Smart cup uses ceramic coating, not Teflon-type coating nonstick.
✓Naturally PFAS-free material
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.