Cold Tumbler vs Rise 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

Why this gradeBuy

Klean Kanteen

Rise Tumbler

PFAS grade

A 100/100

Overall grade

B 88/100

Verdict

Buy

Hazard flags

⚑ 3

Material

18/8 stainless steel body, likely stainless steel or silicone lid

Confidence

78%

PossibleNickel leaching from stainless steel

PossibleSilicone lid degradation and ingestion

PossibleBacterial growth in lid seals

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