Beacon Vacuum Insulated Stainless Steel Tumbler vs Stainless King Tumbler: which is safer?
Stainless King Tumbler is our pick: better on PFAS and on the overall hazard picture.
Ello
Beacon Vacuum Insulated Stainless Steel Tumbler
PFAS grade
A 95/100
Overall grade
B 87/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Stainless steel and glass, vacuum insulated
Confidence
78%
PossibleBacterial growth in lid gaskets and seals
PossibleVacuum seal degradation and loss of insulation
Our pick
Thermos
Stainless King Tumbler
PFAS grade
A 95/100
Overall grade
A 91/100
Verdict
Buy
Hazard flags
⚑ 1
Material
Stainless steel interior, plastic exterior lid
Confidence
78%
PossiblePlastic lid degradation and 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 drinkware tumblers: see the full ranking