The IceFlow Fast Flow Tumbler vs Rambler Tumbler YETI: which is safer?
Rambler Tumbler YETI is the clear pick. Stanley The IceFlow Fast Flow Tumbler carries a failing PFAS grade, and we never recommend buying a failing product.
Stanley
The IceFlow Fast Flow Tumbler
PFAS grade
D 65/100
Overall grade
F 53/100
Verdict
Skip
Hazard flags
⚑ 3
Material
Stainless steel vacuum insulated walls, plastic lid and base
Confidence
72%
PossiblePlastic lid and base thermal stability
PossibleGasket or seal material hazard
PossibleMicroplastic shedding from lid
Our pick
Yeti
Rambler Tumbler YETI
PFAS grade
B 80/100
Overall grade
C 76/100
Verdict
Buy
Hazard flags
⚑ 1
Material
18/8 stainless steel, no coating
Confidence
82%
PossibleNickel leaching from stainless steel
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 & travel mugs: see the full ranking