Byron 2.0 Stainless Steel Travel Mug Snapseal vs Leakproof Oasis Go+ Tumbler: which is safer?

Contigo Byron 2.0 Stainless Steel Travel Mug Snapseal is the clear pick. Ello Leakproof Oasis Go+ Tumbler carries a failing PFAS grade, and we never recommend buying a failing product.

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

Ello

Leakproof Oasis Go+ Tumbler

PFAS grade

F 40/100

Overall grade

F 20/100

Verdict

Skip

Hazard flags

⚑ 5

Material

Double-wall plastic tumbler with leakproof seal and thermal insulation

Confidence

62%

PossibleBPA/BPS or phthalate leaching from plastic base

PossibleCoating degradation and leaching from water-repellent coating or adhesion layers

PossibleSilicone or rubber seal degradation

Why this grade

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