Cold Tumbler vs REI Co-op MiiR 360 Traveler - 20 fl. oz. Pink: which is safer?

Ember Cold Tumbler is the clear pick. REI Co-op MiiR 360 Traveler - 20 fl. oz. Pink 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

Mira

REI Co-op MiiR 360 Traveler - 20 fl. oz. Pink

PFAS grade

F 40/100

Overall grade

F 28/100

Verdict

Skip

Hazard flags

⚑ 3

Material

Stainless steel with powder-coat interior, likely waterproof treatment

Confidence

62%

PossiblePowder-coat integrity and degradation

PossibleCoating chemical composition (non-PFAS)

PossibleBacterial growth in seals or crevices

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