Insulated Tumbler 40oz vs Byron 2.0 Stainless Steel Travel Mug Snapseal: which is safer?
Contigo Byron 2.0 Stainless Steel Travel Mug Snapseal is our pick: better on PFAS and on the overall hazard picture.
Calpak
Insulated Tumbler 40oz
PFAS grade
B 85/100
Overall grade
C 77/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Stainless steel with vacuum insulation
Confidence
78%
PossibleLid/gasket material degradation
PossibleVacuum seal failure and condensation
Our pick
Contigo
Byron 2.0 Stainless Steel Travel Mug Snapseal
PFAS grade
A 95/100
Overall grade
B 83/100
Verdict
Buy
Hazard flags
⚑ 3
Material
Stainless steel, silicone gasket
Confidence
78%
PossibleSilicone gasket degradation
PossibleThermal stress cracking
PossibleLid seal failure and contamination
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