Rambler Tumbler YETI vs Rambler 20 oz Stackable Cup: which is safer?
Rambler Tumbler YETI is the clear pick. YETI Rambler 20 oz Stackable Cup 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 20 oz Stackable Cup
PFAS grade
Good 65/100
Overall grade
Good 59/100
Verdict
Skip
Hazard flags
⚑ 1
Material
Stainless steel cup body
Confidence
72%
PossibleSilicone gasket degradation and microbial growth
Where these two actually differ
- We flag Nickel leaching from stainless steel on the Yeti and not on the Yeti.
- We flag Silicone gasket degradation and microbial growth on the Yeti and not on the Yeti.
- The Yeti is 18/8 stainless steel, no coating where the Yeti is Stainless steel cup body, 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