Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid vs LocknLock Stainless Steel Food Storage Containers with Lids, Metal Lunch Boxes, Leak-Proof, Microwave, Freezer and Dishw: 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
Lock & Lock
LocknLock Stainless Steel Food Storage Containers with Lids, Metal Lunch Boxes, Leak-Proof, Microwave, Freezer and Dishw
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleSilicone gasket degradation
PossibleBacterial colonization in seal crevices
Where these two actually differ
- We flag Bacterial growth in vacuum seal and Surface corrosion under acidic conditions on the Klean Kanteen and not on the Lock & Lock.
- We flag Bacterial colonization in seal crevices on the Lock & Lock and not on the Klean Kanteen.
- Both carry a flag for Silicone gasket degradation, so neither choice avoids it.
- The Klean Kanteen is Stainless steel body, silicone gasket lid seal where the Lock & Lock is Stainless steel and metal, which is most of the difference in these two grades.
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