24 oz Travel Tumbler vs FreeSip Sway Stainless Steel: which is safer?
Owala FreeSip Sway Stainless Steel is our pick: better on PFAS and on the overall hazard picture.
Hydro Flask
24 oz Travel Tumbler
PFAS grade
Good 70/100
Overall grade
Good 59/100
Verdict
Skip
Hazard flags
⚑ 1
Material
Stainless steel double-wall insulation, no interior coating disclosed
Confidence
72%
PossibleLid seal degradation and bacterial growth
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
Where these two actually differ
- We flag Lid seal degradation and bacterial growth on the Hydro Flask 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 Hydro Flask.
- The Hydro Flask is Stainless steel double-wall insulation, no interior coating disclosed where the Owala is Stainless steel body, no interior coating disclosed, 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