40oz Stainless Steel Straw Tumbler vs FreeSip Sway Stainless Steel: which is safer?
These two grade almost identically. Pick on price and preference; neither has a PFAS edge.
Owala
40oz Stainless Steel Straw Tumbler
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePlastic exterior off-gassing or additives
PossibleLid and straw degradation over time
PossibleMold or bacterial growth in double-wall cavity
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 exterior off-gassing or additives, Lid and straw degradation over time and Mold or bacterial growth in double-wall cavity 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 interior, BPA-free plastic exterior where the Owala is Stainless steel body, no interior coating disclosed, 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