16 oz Smart Tumbler vs Cold Tumbler: which is safer?

Ember Cold Tumbler is the clear pick. Ember 16 oz Smart Tumbler carries a failing PFAS grade, and we never recommend buying a failing product.

Ember

16 oz Smart Tumbler

PFAS grade

F 50/100

Overall grade

F 32/100

Verdict

Skip

Hazard flags

⚑ 3

Material

stainless steel with unspecified internal coating/sealant

Confidence

45%

PossibleUnspecified internal coating degradation

PossiblePolymer leachates from seals and lid

ReportedBrand transparency and safety accountability

Why this grade

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

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