Do Klean Kanteen lunch boxes have PFAS?
Klean Kanteen lunch boxes average 78 out of 100 on PFAS Authority's PFAS and toxin screen across the 4 Klean Kanteen lunch boxes graded as of October 2026, above the 70 out of 100 median for the 42 other lunch boxes brands graded alongside it.
Klean Kanteen lunch boxes average Excellent on our four-band scale. 4 of the 4 we graded are worth buying. That is above 90% 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
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
- 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.
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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.
Klean Kanteen lunch boxes worth buying Good or better, best-graded first
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. Silicone gaskets can degrade or absorb food odors over years of use, especially…
3 hazards checked on this product, all on its full breakdown.
- stainless steel with bamboo fiber lid
- We found no PFAS statement from the brand
- Bamboo fiber lid degradation and microbial growth. Natural fiber composites can absorb moisture in seams and…
2 hazards checked on this product, all on its full breakdown.
- stainless steel container with glass or ceramic lid
- We found no PFAS statement from the brand
- Ceramic or glass lid degradation. Ceramic lids may develop micro-cracks or glaze wear over time from repeated…
2 hazards checked on this product, all on its full breakdown.
- Stainless steel container, food-grade silicone lid
- We found no PFAS statement from the brand
- Silicone elastomer degradation. Food-grade silicone is stable at room temperature and mild heating but can…
Better lunch boxes from other brands
Graded higher than the Klean Kanteen average of 78.
- 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.
- 304 stainless steel container with silicone or rubber gasket lid seal
- Nickel leaching from 304 stainless steel
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. Klean Kanteen averages 78.
See every Klean Kanteen product we grade on the Klean Kanteen brand page, or the full lunch boxes ranking.