27oz Stainless Steel Tumbler vs 34 oz. Stainless Mug with Lid Handle: which is safer?

Zojirushi 27oz Stainless Steel Tumbler is our pick: better on PFAS and on the overall hazard picture.

Our pick

Zojirushi

27oz Stainless Steel Tumbler

PFAS grade

A 95/100

Overall grade

B 83/100

Verdict

Buy

Hazard flags

⚑ 3

Material

stainless steel with standard plastic lid

Confidence

82%

PossiblePlastic lid leaching (BPA, BPS, or other endocrine disruptors)

PossibleLid degradation and microplastic release

PossibleSeal material contamination or mold growth

Why this gradeBuy

Zojirushi

34 oz. Stainless Mug with Lid Handle

PFAS grade

A 95/100

Overall grade

C 77/100

Verdict

Buy

Hazard flags

⚑ 3

Material

stainless steel with silicone lid gasket

Confidence

85%

PossibleSilicone gasket degradation and off-gassing

ReportedMicrobial growth (mold, bacteria) in gasket seams

PossibleLid latch or handle durability

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 drink tumblers: see the full ranking