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Mainstays

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

1,037 ratings
Mainstays 20 oz Stainless Steel Double Wall Tumbler , 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 Green ColorMainstays 20 fl oz Stainless Steel Double Wall Tumbler Straw Lid Blue 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

  • Cold Retention: Featuring double-wall vacuum insulation, it keeps beverages ice-cold for hours, perfect for hot summer days or intense outdoor activities.
  • Durable Construction: Made from sturdy 18/8 stainless steel, this tumbler withstands daily bumps and scratches, ensuring long-lasting use.
  • Ergonomic Handle: Designed with an ergonomic handle, it provides a comfortable grip, making it easy to hold and drink from anywhere, anytime.
  • Travel-Friendly: With a 20-ounce capacity, it fits well in most car cup holders and exercise equipment, making it convenient for travel and workouts.
  • Easy Maintenance: The wide-mouth design allows for effortless ice addition and cleaning, and it's dishwasher-safe for added convenience.
  • Straw Lid: Comes with a straw lid and two straws, featuring a four-way threaded design for different straw placements based on your drinking hand preference.
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Current price is $9.97
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About this item

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Customer ratings & reviews

4.3 out of 5 stars
stars
1,037 ratings245 reviews
How item rating is calculated
  1. 5 stars69% (718)
  2. 4 stars11% (117)
  3. 3 stars7% (71)
  4. 2 stars3% (32)
  5. 1 star10% (99)

Reviews summary

Pros

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

Neutral

  • : Can be smooth with silicone straw, but often proves difficult due to design.

Cons

  • : Straw's narrow design hinders liquid flow.
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Showing 1-3 of 245 reviews

Jan 15, 2026
Mikeymom
Top Reviewer
Item details
Color: Blue
5 out of 5 stars review

Verified Purchase

Cold all day

Delightful. Keeps beverages cold all day, seals tight, doesn't leak or drip. Easy top rack dishwasher cleanup. The straw is not a favorite. Don't like the texture and found it difficult to assemble for proper uptake. Insert a plasiic straw through the plug and it's perfect. Have two and will be purchasing at least one more.

Helpful?1XBPWO68IP4C13453350769
May 24, 2026
Angela
Top Reviewer
Item details
Color: Purple
5 out of 5 stars review

Verified Purchase

Great Everyday Cup

I've been using this daily and it's honestly been really good for the price. It keeps my drinks cold for hours, and I love that it doesn't sweat on the outside. The purple color is super pretty, and the straw lid makes it easy to carry around with me. It feels sturdy and fits nicely in my cup holder too.

Helpful?1XBPWO68IP4C13453350769
Dec 29, 2025
Diego
Walmart Associate
Item details
Color: Purple
5 out of 5 stars review

Verified Purchase

great buy!

the cup is great keeps hot and cold. kept ice for over 12 hrs. pretty good for a 10.00 cup. The one thing I don't care for is the suction power you need with the straw. it's truly leak proof so I get why you need to use a little more strength. aside from that the cup is awesome!

Helpful?1XBPWO68IP4C13453350769