Do S'well lunch boxes have PFAS?
S'well lunch boxes average 73 out of 100 on PFAS Authority's PFAS and toxin screen across the 4 S'well lunch boxes graded as of October 2026, above the 70 out of 100 median for the 42 other lunch boxes brands graded alongside it.
S'well lunch boxes average Good on our four-band scale. 4 of the 4 we graded are worth buying. That is above 76% of the lunch boxes brands we grade.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
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Top-graded picks in the categories readers replace first, every one scored on the same rubric.
- polypropylene filter housing, carbon/sediment cartridge
- We found no PFAS statement from the brand
- Bacterial growth in spent cartridges
3 hazards checked on this product, all on its full breakdown.
Aquasure
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- RO membrane, carbon filters, stainless steel housing
- We found no PFAS statement from the brand
- Bacterial and microbial growth in housing and filters
4 hazards checked on this product, all on its full breakdown.
Avocado
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- organic cotton, natural latex, coconut coir, recycled steel coils
- The brand calls it PFAS-free, which we have not verified
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2 hazards checked on this product, all on its full breakdown.
What S'well says and does about PFAS
S’well publishes nothing about PFAS. Its only materials and safety answer covers stainless steel, BPA and California Proposition 65 compliance, and a search of its own site returns product listings rather than any PFAS statement. Where it does name a gasket material it names silicone, on its glass bottle line. No Proposition 65 notice has been filed against the brand and we found no independent testing of its drinkware.
- Brand statementS’well says its products are made of 18/8 food-grade stainless steel that does not need a liner, that they are BPA-free, and that they comply with California Proposition 65 and FDA food contact rules. The answer does not mention PFAS or any coating chemistry. S’well ↗
- MaterialsOn its glass bottle line S’well names the lid gasket as silicone, which is not a fluorinated polymer. It does not state the gasket material for its insulated drinkware. S’well ↗
Sources checked October 1, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.
S'well lunch boxes worth buying Good or better, best-graded first
- stainless steel, silicone seals
- Silicone seal degradation. Silicone seals degrade with age, heat cycles, and UV exposure. Compromised seals…
2 hazards checked on this product, all on its full breakdown.
- stainless steel, plastic lid/seals
- Plastic lid/seal composition not disclosed, S'well does not publicly specify the polymer type or additives in…
2 hazards checked on this product, all on its full breakdown.
- Stainless steel and glass
- Metal leaching (aluminum, nickel, chromium). Stainless steel 18/8 is food-approved, but nickel and chromium…
3 hazards checked on this product, all on its full breakdown.
- stainless steel body, silicone gasket
- Silicone gasket composition and additives. The gasket material is not publicly specified by S'well. While…
3 hazards checked on this product, all on its full breakdown.
Better lunch boxes from other brands
Graded higher than the S'well average of 73.
Klean Kanteen
Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid
- Stainless steel body, silicone gasket lid seal
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation
3 hazards checked on this product, all on its full breakdown.
- borosilicate glass
- We found no PFAS statement from the brand
- Leaching from glass matrix or lid seals
2 hazards checked on this product, all on its full breakdown.
- Stainless steel container, no surface treatment
- Lid/gasket polymer leaching
3 hazards checked on this product, all on its full breakdown.
The same question, asked of the other lunch boxes brands
Best average grade first. S'well averages 73.
See every S'well product we grade on the S'well brand page, or the full lunch boxes ranking.