Cup 14 oz Slate Black vs Tumblers - Set of 4: which is safer?

Ember Tumblers - Set of 4 is our pick: better on PFAS and on the overall hazard picture.

Ember

Cup 14 oz Slate Black

PFAS grade

A 100/100

Overall grade

B 86/100

Verdict

Buy

Hazard flags

⚑ 2

Material

Ceramic or ceramic-coated stainless steel with heated base

Confidence

72%

PossibleCeramic coating degradation and heavy metal release

ReportedMaterial disclosure and transparency gaps

Why this gradeBuy

Our pick

Ember

Tumblers - Set of 4

PFAS grade

A 100/100

Overall grade

B 88/100

Verdict

Buy

Hazard flags

⚑ 3

Material

Stainless steel double-wall insulated

Confidence

72%

PossibleDouble-wall separation and structural failure

PossibleLid seals and gasket materials

PossibleNickel sensitivity from stainless steel contact

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