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Mainstays

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

4.4 stars out of 728 reviews
(4.4)|
728 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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Columbus, 43215
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About this item

Product details

Warnings

Customer ratings & reviews

4.4 out of 5 stars
stars728 ratings247 reviews
How item rating is calculated
  1. 5 stars76% (551)
  2. 4 stars8% (58)
  3. 3 stars5% (35)
  4. 2 stars2% (17)
  5. 1 star9% (67)

Reviews summary

Pros
  • : Maintains temperature for several hours or overnight.
  • : Made with sturdy materials for a solid feel.
  • : Offers great value at this cost.
  • : Keeps drinks cold for 8-24 hours.
Cons
  • : May break or crack with handling or drops.
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Showing 1-3 of 247 reviews

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
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
Jan 2, 2026
Walmart customer
Top Reviewer
Item details
Color: Black
5 out of 5 stars review

Verified Purchase

I wear a CPAP mask at night and like to have cold water to drink without taking off the mask. This bottle keeps water cold for a long time, and the straw can slip under the mask edge so I can sip some without taking off the mask. It will leak if rather full and ripped over while the straw is in. And the lid is a little fussy to get started right. If the kid isnt on perfectly even, it will leak if tipped.

Helpful?5O2GLGI87PAA5298196424