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

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 Color:Black

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
stars946 ratings227 reviews
How item rating is calculated
  1. 5 stars70% (659)
  2. 4 stars11% (104)
  3. 3 stars7% (69)
  4. 2 stars3% (29)
  5. 1 star9% (85)

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.
  • : Made to withstand drops and regular use.

Neutral

  • : Can be smooth with silicone straw, but often proves difficult due to design.
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Showing 1-3 of 227 reviews

Jun 9, 2025
Charlotte
Top Reviewer
Item details
Color: Blue
5 out of 5 stars review

Verified Purchase

My son's new favorite forever tumbler!

I have tried about a dozen different tumblers for my 2.5 year old son who loves water and this one is by far the best one! The size is perfect, design is super cute, no issues with leaking so far, overall it meets every requirement I'd have. Straw is easy to drink out of, no issues with suction. It keeps drinks cold with ice and we intend to purchase a second one. I would highly recommend this tumbler to anyone with kids!

Helpful?1XBPWO68IP4C13453350769
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
Sep 11, 2025
Heather
Item details
Color: Green
5 out of 5 stars review

Verified Purchase

I like it and the state is made where it does not leak.. although if you are someone who doesn't want to kind of bite down or push down on the straw w/ your lips you would want to go with something else. However if that doesn't bother you then I highly recommend it!

Helpful?1XBPWO68IP4C13453350769