Cold Tumbler vs Ember Mug 2: which is safer?

Ember Cold Tumbler is the clear pick. Ember Mug 2 carries a failing PFAS grade, and we never recommend buying a failing product.

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

Why this gradeBuy

Ember

Ember Mug 2

PFAS grade

F 50/100

Overall grade

F 28/100

Verdict

Skip

Hazard flags

⚑ 4

Material

Stainless steel body, electronic heating element, proprietary interior coating

Confidence

35%

PossibleProprietary interior coating leaching (unknown chemistry)

ReportedCoating degradation over time

PossibleElectronic heating element failure or water intrusion

Why this 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 drinkware: see the full ranking