Mainstays 40 oz Stainless Steel Tumbler with Straw, Handle and Double-Wall Insulation, Black
Mainstays 40 oz Stainless Steel Tumbler with Straw, Handle and Double-Wall Insulation, Black
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Mainstays

Mainstays 40 oz Stainless Steel Tumbler with Straw, Handle and Double-Wall Insulation, Black

932 ratings
Mainstays 40 oz Stainless Steel Tumbler with Straw, Handle and Double-Wall Insulation, BlackMainstays 40 oz Stainless Steel Tumbler with Straw and Handle Double Wall Insulated BlackMainstays 40 oz Stainless Steel Tumbler with Straw and Handle Double Wall Insulated PinkMainstays 40 oz Stainless Steel Tumbler with Straw and Handle Double Wall Insulated White
Actual ColorBlack

Key item features

  • Ample Capacity: Offers a substantial 40 oz capacity, providing generous room for water and other beverages throughout the day. It supports versatile everyday use across various activities.
  • Durable Construction: Crafted from 18/8 recycled stainless steel and BPA-free materials, ensuring a rustproof build without a metallic taste. Its one-piece design enhances product durability.
  • Insulated Features: Incorporates double-wall vacuum insulation to maintain drink temperatures. It comes complete with a lid, a reusable straw, and a large handle for effortless portability.
  • Defined Dimensions: Measures 10.47 inches high, 3.94 inches long, and 5.91 inches wide, weighing 1.29 pounds. Its specific size contributes to practical handling and transport.
  • Versatile Aesthetics: Features a sleek black finish, presenting a simple yet versatile look. This design is suitable for diverse settings, including home, office, and on-the-go activities.
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About this item

Product details

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Customer ratings & reviews

4.4 out of 5 stars
stars
932 ratings283 reviews
How item rating is calculated
  1. 5 stars75% (702)
  2. 4 stars8% (77)
  3. 3 stars5% (45)
  4. 2 stars3% (28)
  5. 1 star9% (80)

Reviews summary

Pros

  • : Holds plenty of liquid without needing frequent refills.
  • : Made with sturdy materials for a solid feel.
  • : Offers great quality at a lower cost.
  • : Maintains temperature for several hours with remaining ice.
  • : Keeps ice for several hours or even days.

Cons

  • : May break or crack with rough handling or drops.
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Showing 1-3 of 283 reviews

Apr 19, 2026
Reviewer name: DR
Top Reviewer
Item details
Color: Black
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

GRAB THIS - Wonderful!

40 Ounces. Insulated, and kept my drink nice and cold for 5 plus hours outside - even though the temps went to the mid 80s', and the cup is BLACK... I was a bit surprised my drink was still cold under the blaring sun on a cloudless day! Fits into a regular vehicle cup holder - built in or add on, long so if you have a deep built-in cup or add on holder in vehicle, this will fit perfectly! The lid is a twist to shut, but I never had the need to shut it, comes with a nice thick reusable straw... I did place the cup in the freezer for a quick chill - held up fine, whatever water or tea I didn't finish, would be refrigerated, and surprisingly, still fresh!

Helpful?5O2GLGI87PAA5298196424
Jun 9, 2026
Reviewer name: Mark
Item details
Color: Black
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Worthwhile purchase.

I have only been using it for a few days, but it seems to be equivalent to the brand name tumblers used by family members and at one -half to one-third the cost. It is too soon to comment on the longevity of the coating or the functionality of the lid.

Helpful?5O2GLGI87PAA5298196424
Feb 10, 2026
Reviewer name: Kelly
Top Reviewer
Item details
Color: Black
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great value tumbler, does the job without the hype

I'm really impressed with the Mainstays 40 oz Stainless Steel Tumbler. For the price, it performs way better than I expected. It keeps my drinks cold for hours (even with ice), and the stainless steel feels sturdy and well made. The handle is comfortable and makes it easy to carry around, especially for long days or car trips. The straw is a nice bonus and works well for both water and iced drinks. I also like the size — it holds plenty so I don't have to constantly refill. It fits in my car's cup holder, which is a huge plus. Overall, this is a great affordable alternative to more expensive tumblers. If you want something practical, durable, and budget-friendly, this is definitely worth buying.

Helpful?5O2GLGI87PAA5298196424
Current price is $12.4431.1 ¢/oz
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