Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid vs Comeback Lunchbox: which is safer?
Klean Kanteen Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid is our pick: better on PFAS and on the overall hazard picture.
Our pick
Klean Kanteen
Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleSilicone gasket degradation
PossibleBacterial growth in vacuum seal
PossibleSurface corrosion under acidic conditions
Stanley
Comeback Lunchbox
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleBPA/BPS in plastic lid and latch
PossiblePhthalate plasticizers in latches
PossibleMicroplastics from lid degradation
Where these two actually differ
- We flag Silicone gasket degradation, Bacterial growth in vacuum seal and Surface corrosion under acidic conditions on the Klean Kanteen and not on the Stanley.
- We flag BPA/BPS in plastic lid and latch, Phthalate plasticizers in latches and Microplastics from lid degradation on the Stanley and not on the Klean Kanteen.
- The Klean Kanteen is Stainless steel body, silicone gasket lid seal where the Stanley is stainless steel body, plastic latch and lid, which is most of the difference in these two grades.
- The gap is 30 points, wide enough that this is not a close call, and the Klean Kanteen is the one to buy.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More lunch boxes: see the full ranking