FreeSip Sway Stainless Steel vs FreeSip Tumbler: which is safer?
Owala FreeSip Sway Stainless Steel is our pick: better on PFAS and on the overall hazard picture.
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
Owala
FreeSip Tumbler
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePlastic component leaching (BPA/phthalates)
PossibleMicroplastic shedding from seals and straws
PossibleSeal adhesive or glue outgassing
Where these two actually differ
- 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.
- We flag Plastic component leaching (BPA/phthalates), Microplastic shedding from seals and straws and Seal adhesive or glue outgassing on the Owala and not on the Owala.
- The Owala is Stainless steel body, no interior coating disclosed where the Owala is Stainless steel and plastic components, 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