FreeSip Sway Stainless Steel vs Everyday 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
Stanley
Everyday Tumbler
PFAS grade
Good 70/100
Overall grade
Good 59/100
Verdict
Skip
Hazard flags
⚑ 2
Material
stainless steel, vacuum insulated
Confidence
82%
PossibleSilicone gasket and lid degradation
PossibleBacterial growth in seals and insulation gaps
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 Stanley.
- We flag Silicone gasket and lid degradation and Bacterial growth in seals and insulation gaps on the Stanley and not on the Owala.
- The Owala is Stainless steel body, no interior coating disclosed where the Stanley is stainless steel, vacuum insulated, 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