Foam Insulated Travel Mug GS1500TRI6 vs Rambler 24 oz Mug with Ceramic Lining: which is safer?
Rambler 24 oz Mug with Ceramic Lining is our pick, better on PFAS and on the overall hazard picture.
Thermos
Foam Insulated Travel Mug GS1500TRI6
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFoam insulation degradation
PossibleAdhesive or flame retardant residues in foam
PossibleBacterial colonization in crevices
Our pick
Yeti
Rambler 24 oz Mug with Ceramic Lining
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleCeramic coating degradation over time
PossibleBacterial growth in crevices or damaged coating
PossibleThermal shock or fracture
Where these two actually differ
- We flag Foam insulation degradation, Adhesive or flame retardant residues in foam and Bacterial colonization in crevices on the Thermos and not on the Yeti.
- We flag Ceramic coating degradation over time, Bacterial growth in crevices or damaged coating and Thermal shock or fracture on the Yeti and not on the Thermos.
- The Thermos is Stainless steel interior, foam insulation outer shell where the Yeti is stainless steel exterior, ceramic lining interior, which is most of the difference in these two grades.
Both products run through the same public rubric, which covers 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 travel mugs, see the full ranking