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Mainstays 40 oz Double Wall Stainless Steel Tumbler

Common questions

Is Mainstays 40 oz Double Wall Stainless Steel Tumbler healthy?

Mainstays 40 oz Double Wall Stainless Steel Tumbler scores 85/100 on Scout's independent analysis of ingredients, additives, and lab results — one of the stronger scores in Scout's catalog. Mainstays 40 oz Double Wall Stainless Steel Tumbler scores 85/100.

How does Mainstays 40 oz Double Wall Stainless Steel Tumbler compare to other drinkware?

Mainstays 40 oz Double Wall Stainless Steel Tumbler ranks #7 of 15 drinkware in Scout's independent rankings. The current top score in the category is Hydrapeak Classics Sport Stainless Steel Insulated Bottle at 100/100.

Which ingredients drive Mainstays 40 oz Double Wall Stainless Steel Tumbler's score?

In Scout's ingredient-by-ingredient analysis, 18/8 Stainless Steel, Vacuum Insulation, BPA-Free count in its favor; PFAS / Non-Stick Coating is flagged as an ingredient of concern. The full breakdown, with why each one matters, is in the Key ingredients section on this page.

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Mainstays 40 oz Double Wall Stainless Steel Tumbler

Walmart
85 Excellent
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At a glance

Beneficial ingredients 3
Harmful ingredients 1
Owned by Walmart
Category Drinkware
Summary

Mainstays 40 oz Double Wall Stainless Steel Tumbler scores 85/100. Highlights: stainless steel, vacuum insulated, BPA-free.

Key ingredients 4

18/8 Stainless Steel
Very 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 Insulation
Good

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-Free
Good

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 Coating
Bad

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 →

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