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Mainstays

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

4.4 stars out of 773 reviews
(4.4)|
773 ratings
Mainstays 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 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 Color:Black
selected, Black, $12.44
31.1 ¢/oz
Pink, $13.87
34.7 ¢/fl oz
White, $12.44
31.1 ¢/oz

Key item features

  • Durable Material: Made from 18/8 recycled stainless steel, ensuring a BPA-free and rustproof construction.
  • Insulated Design: Features double-wall vacuum insulation to keep beverages at the desired temperature for longer periods.
  • Generous Capacity: Holds up to 40 ounces, making it ideal for staying hydrated throughout the day.
  • Reusable Straw: Comes with a reusable straw, promoting eco-friendly practices and convenience.
  • Versatile Use: Suitable for various activities such as swimming, sports, travel, camping, and parties.
  • Convenient Handle: Equipped with a large handle for easy carrying and handling.
  • Health-Safe: Made of food-grade stainless steel, ensuring no harm to human health and no metallic taste.
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Current price is $12.4431.1 ¢/oz
Price when purchased online
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About this item

Product details

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Customer ratings & reviews

4.4 out of 5 stars
stars773 ratings254 reviews
How item rating is calculated
  1. 5 stars75% (583)
  2. 4 stars8% (64)
  3. 3 stars5% (37)
  4. 2 stars3% (20)
  5. 1 star9% (69)

Reviews summary

Pros
  • : Holds plenty of liquid without needing frequent refills.
  • : Keeps cold for hours, even overnight.
  • : Made with sturdy materials for a solid feel.
  • : Maintains temperature for several hours with ice.
  • : Offers great quality at a lower cost.
Cons
  • : May break or crack with rough handling or drops.
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Showing 1-3 of 254 reviews

Jun 20, 2025
Johnny
Item details
Color: Black
5 out of 5 stars review

Verified Purchase

it will keep us overnight easily. keeps everything cold I love it. the only thing I don't like the lid is a little difficult to put on. and it's top heavy it will tilt over very easily. but I would order another one without thinking twice about it highly recommend it

Helpful?5O2GLGI87PAA5298196424
Nov 2, 2025
Anita
Top Reviewer
Item details
Color: Black
5 out of 5 stars review

Verified Purchase

Great cup for water drinkers

If water is your drink of choice, this LARGE 40 oz cup is what you need to own. It has a stainless steel inside and a plastic outside. The lid screws on and the only way to drink out of it is the tough plastic straw. If you don't want to drink out of the straw, you can unscrew the lid and drink out of the cup. Be aware that if you spill it, EVER YTHING will get wet!

Helpful?5O2GLGI87PAA5298196424
Feb 10, 2026
Kelly
Top Reviewer
Item details
Color: Black
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.

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