34 oz. Stainless Mug with Lid Handle vs Stainless Tumbler: which is safer?
Zojirushi Stainless Tumbler is our pick: better on PFAS and on the overall hazard picture.
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
Our pick
Zojirushi
Stainless Tumbler
PFAS grade
A 95/100
Overall grade
B 87/100
Verdict
Buy
Hazard flags
⚑ 2
Material
stainless steel body, no reported coating
Confidence
78%
PossibleSeal/gasket degradation and microbial growth
PossibleNickel sensitivity or leaching
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