Mainstays 40 oz Double Wall Stainless Steel Tumbler
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Summary
Mainstays 40 oz Double Wall Stainless Steel Tumbler scores 85/100. Highlights: stainless steel, vacuum insulated, BPA-free.
At a glance
Key ingredients 4
18/8 Stainless SteelVery Good
Food-grade 18/8 stainless steel is non-reactive, durable, and does not leach BPA, phthalates, or microplastics into beverages — the gold standard for reusable drinkware.
See more about 18/8 Stainless Steel →Vacuum InsulationGood
Double-wall vacuum insulation keeps beverages cold for 24 hours or hot for 12 hours without condensation on the exterior.
See more about Vacuum Insulation →BPA-FreeGood
BPA (bisphenol A) is an endocrine disruptor linked to hormonal disruption. BPA-free construction eliminates this specific exposure risk.
See more about BPA-Free →PFAS / Non-Stick CoatingBad
PFAS (per- and polyfluoroalkyl substances) used in non-stick lid coatings are 'forever chemicals' that bioaccumulate and are linked to cancer, thyroid disruption, and immune suppression.
See more about PFAS / Non-Stick Coating →Get the full breakdown in the Scout app
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