FreeSip Sway Stainless Steel vs Stainless Steel Straw Tumbler Route 66: 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
Stainless Steel Straw Tumbler Route 66
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleCoating degradation and microplastic shedding from exterior print
ReportedLid or seal material not specified
PossibleCorrosion pitting from saltwater or highly acidic exposure
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 Coating degradation and microplastic shedding from exterior print, Lid or seal material not specified and Corrosion pitting from saltwater or highly acidic exposure on the Owala and not on the Owala.
- The Owala is Stainless steel body, no interior coating disclosed where the Owala is Stainless steel tumbler, bare uncoated, which is most of the difference in these two grades.
- These two are level, close enough that price and fit should decide it rather than our grade.
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