Cold Tumbler vs Trek Pivot Kids Flip Straw Tumbler: which is safer?
Ember Cold Tumbler is our pick: better on PFAS and on the overall hazard picture.
Our pick
Ember
Cold Tumbler
PFAS grade
A 100/100
Overall grade
A 92/100
Verdict
Buy
Hazard flags
⚑ 2
Material
stainless steel with silicone seal
Confidence
72%
PossibleSilicone seal degradation and microbial growth
PossibleCoatings or adhesives on printed logos
Simple Modern
Trek Pivot Kids Flip Straw Tumbler
PFAS grade
B 85/100
Overall grade
F 63/100
Verdict
Buy
Hazard flags
⚑ 4
Material
Tritan copolyester plastic body, stainless steel components
Confidence
72%
PossibleMicroplastic generation from plastic body wear
PossibleGasket and seal leachables
ReportedStraw choking hazard (design-specific risk)
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 drinkware: see the full ranking