Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid vs Twist 'N Loc Medium Containers & Lids: 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
Ziploc
Twist 'N Loc Medium Containers & Lids
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleMicroplastics or oligomer migration on heating
PossibleMold or bacterial growth if sealed improperly
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 Ziploc.
- We flag Microplastics or oligomer migration on heating and Mold or bacterial growth if sealed improperly on the Ziploc and not on the Klean Kanteen.
- The Klean Kanteen is Stainless steel body, silicone gasket lid seal where the Ziploc is polypropylene plastic container 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