Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid vs Cook & Freeze Rectangular Dish with Lid 800ml: 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
Pyrex
Cook & Freeze Rectangular Dish with Lid 800ml
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleGlass breakage and sharp edges
PossibleBacterial growth in lid seals
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 Pyrex.
- We flag Glass breakage and sharp edges and Bacterial growth in lid seals on the Pyrex and not on the Klean Kanteen.
- The Klean Kanteen is Stainless steel body, silicone gasket lid seal where the Pyrex is borosilicate glass, polypropylene lid, 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