Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid vs MB Original Bento Box: 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
Excellent 100/100
Overall grade
Excellent 88/100
Verdict
Buy
Hazard flags
⚑ 3
Material
Stainless steel body, silicone gasket lid seal
Confidence
82%
PossibleSilicone gasket degradation
PossibleBacterial growth in vacuum seal
PossibleSurface corrosion under acidic conditions
Monbento
MB Original Bento Box
PFAS grade
Good 70/100
Overall grade
Good 66/100
Verdict
Buy
Hazard flags
⚑ 1
Material
ABS plastic and stainless steel construction
Confidence
72%
PossibleMicroplastics from 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 Monbento.
- We flag Microplastics from degradation on the Monbento and not on the Klean Kanteen.
- The Klean Kanteen is Stainless steel body, silicone gasket lid seal where the Monbento is ABS plastic and stainless steel construction, 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