Byron 2.0 Stainless Steel Travel Mug Snapseal vs Stainless Steel Tumbler Slide Lock Lid: which is safer?

Thermos Stainless Steel Tumbler Slide Lock Lid is our pick: better on PFAS and on the overall hazard picture.

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

Our pick

Thermos

Stainless Steel Tumbler Slide Lock Lid

PFAS grade

A 95/100

Overall grade

B 87/100

Verdict

Buy

Hazard flags

⚑ 2

Material

Stainless steel body, plastic/silicone lid

Confidence

72%

PossiblePlastic lid polymer identity and BPA/BPS status

PossibleLid degradation and microplastic shedding from heat exposure

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