Byron 2.0 Stainless Steel Travel Mug Snapseal vs Shake Go Tumbler: which is safer?

Contigo Byron 2.0 Stainless Steel Travel Mug Snapseal is our pick: better on PFAS and on the overall hazard picture.

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

Contigo

Shake Go Tumbler

PFAS grade

B 85/100

Overall grade

C 73/100

Verdict

Buy

Hazard flags

⚑ 3

Material

Plastic (BPA-free) and stainless steel interior

Confidence

72%

PossibleBPA/BPS and bisphenol alternatives in plastic shell

PossiblePlastic degradation and microplastic shedding

PossibleAdhesive or bonding agent leaching at plastic-steel interface

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