40oz Stainless Steel Tumbler vs Byron 2.0 Stainless Steel Travel Mug Snapseal: which is safer?
These two grade almost identically. Pick on price and preference; neither has a PFAS edge.
Calpak
40oz Stainless Steel Tumbler
PFAS grade
A 95/100
Overall grade
B 83/100
Verdict
Buy
Hazard flags
⚑ 3
Material
Stainless steel, bare uncoated
Confidence
78%
PossibleNickel leaching (stainless steel alloy)
PossibleLid gasket and seal degradation
PossibleBacterial or mold growth in insulation gap
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