20oz Double Wall Tumbler With Vacuum Sealer vs Byron 2.0 Stainless Steel Travel Mug Snapseal: which is safer?

Contigo Byron 2.0 Stainless Steel Travel Mug Snapseal is the clear pick. 20oz Double Wall Tumbler With Vacuum Sealer carries a failing PFAS grade, and we never recommend buying a failing product.

Calpak

20oz Double Wall Tumbler With Vacuum Sealer

PFAS grade

F 50/100

Overall grade

F 28/100

Verdict

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Hazard flags

⚑ 4

Material

Double-wall stainless steel or similar, internal coating unspecified

Confidence

35%

PossibleInternal adhesive or coating composition (unspecified)

PossibleTeflon-type coating (Teflon-like) fume risk from internal coating

PossibleCoating degradation over time

Why this grade

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

Why this gradeBuy

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