Glass Meal Prep Set vs Flex Seal 28-pc. Food Storage Set: which is safer?
Pyrex Glass Meal Prep Set is our pick, better on PFAS and on the overall hazard picture.
Our pick
Pyrex
Glass Meal Prep Set
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleMetal lid corrosion and leaching
ReportedSilicone or rubber gasket degradation
ReportedThermal shock fracture from glass
Rubbermaid
Flex Seal 28-pc. Food Storage Set
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleMicroplastic generation from wear
PossibleOligomer leaching under heat or lipid contact
ReportedLid seal degradation
Where these two actually differ
- We flag Metal lid corrosion and leaching, Silicone or rubber gasket degradation and Thermal shock fracture from glass on the Pyrex and not on the Rubbermaid.
- We flag Microplastic generation from wear, Oligomer leaching under heat or lipid contact and Lid seal degradation on the Rubbermaid and not on the Pyrex.
- The Pyrex is borosilicate glass with metal lids (likely stainless steel or aluminum) where the Rubbermaid is Polypropylene (PP) plastic lids and containers, which is most of the difference in these two grades.
Both products run through the same public rubric, which covers 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 food storage containers, see the full ranking