Mainstays 20 oz Stainless Steel Double Wall Tumbler with Straw Lid, Black
Mainstays 20 oz Stainless Steel Double Wall Tumbler with Straw Lid, Black
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Mainstays

Mainstays 20 oz Stainless Steel Double Wall Tumbler with Straw Lid, Black

1,227 ratings
Mainstays 20 oz Stainless Steel Double Wall Tumbler with Straw Lid, BlackMainstays 20 fl oz Stainless Steel Double Wall Tumbler Straw Lid Black ColorMainstays 20 fl oz Stainless Steel Double Wall Tumbler Straw Lid Pink ColorMainstays 20 fl oz Stainless Steel Double Wall Tumbler Straw Lid Purple Color
Actual ColorBlack

Key item features

  • Durable Steel Build: Constructed from robust 18/8 stainless steel, this tumbler offers a sturdy build for everyday use. Its 20 oz capacity is ideal for various hot or cold drinks, emphasizing practical daily utility.
  • Extended Temperature Retention: Features double-wall vacuum insulation, engineered to maintain your beverages at their ideal hot or cold temperature for hours, ensuring a consistent and enjoyable drinking experience throughout the day.
  • Versatile Straw System: Includes a versatile straw lid and two straws for immediate convenience. The four-way threaded design allows adjusting straw position to suit individual drinking preferences and hand orientation.
  • Comfortable Travel Design: Designed with an ergonomic handle for a comfortable hold and a cupholder-friendly shape, making it effortlessly portable for car travel or other on-the-go activities.
  • Modern Easy Care: Offers easy cleaning with its dishwasher-safe design. The sleek black finish provides a clean, modern aesthetic, ensuring the tumbler is both functional and visually appealing for daily use.
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Specs

Volume capacity, 20 ozMaterial, Stainless SteelColor, BlackBrand, MainstaysColor category, BlackActivity, Travel

About this item

Product details

This Mainstays tumbler is a 20 oz stainless steel cup made for drinks on the go. Double-wall vacuum insulation helps keep hot or cold beverages at the right temperature for hours. The ergonomic handle gives you a comfortable hold, while the cupholder-friendly shape makes it easy to bring along in the car or during travel. A four-way threaded straw lid lets you adjust the straw position to suit your drinking hand preference, and the black finish gives it a clean, modern look.
  • Made with 18/8 stainless steel for a sturdy, everyday build.
  • Includes a straw lid and two straws for ready-to-use convenience.
  • 20 oz capacity offers a practical size for water, coffee, and other favorite drinks.
  • Dishwasher-safe design makes cleanup simple.
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.  

Specifications

Volume capacity

20 oz

Material

Stainless Steel

Color

Black

Brand

Mainstays

Warranty

Warranty information

Dishwasher safe

Warnings

Customer ratings & reviews

4.3 out of 5 stars
stars
1,227 ratings277 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars69% (851)
  2. 4 stars11% (135)
  3. 3 stars7% (81)
  4. 2 stars4% (45)
  5. 1 star9% (115)

Reviews summary

Pros

  • : Straw and lid can be removed for cleaning.
  • : Ideal for carrying and fitting in cup holders.
  • : Available in various attractive shades.
  • : Made to withstand drops and regular use.
  • : Offers good features and performance for the cost.

Neutral

  • : Can be smooth with silicone straw, but often proves difficult due to design.
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Showing 1-3 of 277 reviews

Nov 1, 2026
Reviewer name: Desiree
Top Reviewer
Item details
Color: Black
4 out of 5 stars
4 out of 5 stars review

Verified Purchase

The straw is a downfall

Pretty great cup over all, I do not like the attached straw tho so it is greeting four out of five. Kind of a big deal really other than that. It's a great cup keeps your drink. Cool your ice iced it's just that darn straw. I find it annoying.

Helpful?1XBPWO68IP4C13453350769
Oct 20, 2026
Reviewer name: anonymous
Walmart Associate
Item details
Color: Purple
4 out of 5 stars
4 out of 5 stars review

Verified Purchase

Good for the price

I got this for work cause I like warm drinks but they always get cold before i finish them. this keeps them warm much longer and its smooth so i can decorate with stickers. I dont like using the lid so i keep it off.

Helpful?1XBPWO68IP4C13453350769
Jun 12, 2026
Reviewer name: ATASHA
Item details
Color: Pink
3 out of 5 stars
3 out of 5 stars review

Verified Purchase

Not the best, but ok

It's ok for the price. The lid doesn't have a good ventilation hole so it's hard to suck through the straw. Spill proof straw is a neat feature. doesn't stay cold for as long as stated.

Helpful?1XBPWO68IP4C13453350769
Current price is $9.97
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