40 oz Tumbler vs FreeSip Sway Stainless Steel: which is safer?
Owala FreeSip Sway Stainless Steel is our pick: better on PFAS and on the overall hazard picture.
Owala
40 oz Tumbler
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePlastic component degradation under heat
PossibleStainless steel surface damage and corrosion
PossibleSeal gasket and lid bacterial growth
Our pick
Owala
FreeSip Sway Stainless Steel
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleSilicone and plastic lid/valve leachables
PossibleBacterial growth in valve mechanism
PossibleOff-gassing or odor transfer
Where these two actually differ
- We flag Plastic component degradation under heat, Stainless steel surface damage and corrosion and Seal gasket and lid bacterial growth on the Owala and not on the Owala.
- We flag Silicone and plastic lid/valve leachables, Bacterial growth in valve mechanism and Off-gassing or odor transfer on the Owala and not on the Owala.
- The Owala is Stainless steel and plastic (BPA-free) where the Owala is Stainless steel body, no interior coating disclosed, 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 insulated travel mugs: see the full ranking