FreeSip Sway Stainless Steel vs FreeSip Sway Travel 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
Excellent 80/100
Overall grade
Good 68/100
Verdict
Buy
Hazard flags
⚑ 3
Material
Stainless steel body, no interior coating disclosed
Confidence
87%
PossibleSilicone and plastic lid/valve leachables
PossibleBacterial growth in valve mechanism
PossibleOff-gassing or odor transfer
Owala
FreeSip Sway Travel Tumbler
PFAS grade
Good 70/100
Overall grade
Good 59/100
Verdict
Skip
Hazard flags
⚑ 2
Material
Plastic (acrylic/tritan copolyester) with stainless steel lid
Confidence
72%
PossiblePlastic degradation and microplastic release
PossibleLeaching of oligomers or additives
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 degradation and microplastic release and Leaching of oligomers or additives on the Owala and not on the Owala.
- The Owala is Stainless steel body, no interior coating disclosed where the Owala is Plastic (acrylic/tritan copolyester) with stainless steel 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 insulated travel mugs: see the full ranking