Rambler Tumbler YETI vs Rambler Stackable Cup with MagSlider Lid: which is safer?
Rambler Tumbler YETI is the clear pick. YETI Rambler Stackable Cup with MagSlider Lid carries a failing PFAS grade, and we never recommend buying a failing product.
Our pick
Yeti
Rambler Tumbler YETI
PFAS grade
Excellent 80/100
Overall grade
Excellent 76/100
Verdict
Buy
Hazard flags
⚑ 1
Material
18/8 stainless steel, no coating
Confidence
82%
PossibleNickel leaching from stainless steel
Yeti
Rambler Stackable Cup with MagSlider Lid
PFAS grade
Good 65/100
Overall grade
Good 57/100
Verdict
Skip
Hazard flags
⚑ 2
Material
Stainless steel body, elastomer lid seal
Confidence
72%
PossibleElastomer lid degradation
PossibleMicroplastic or polymer fragments
Where these two actually differ
- We flag Nickel leaching from stainless steel on the Yeti and not on the Yeti.
- We flag Elastomer lid degradation and Microplastic or polymer fragments on the Yeti and not on the Yeti.
- The Yeti is 18/8 stainless steel, no coating where the Yeti is Stainless steel body, elastomer lid seal, which is most of the difference in these two grades.
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