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

1,140 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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Customer ratings & reviews

4.3 out of 5 stars
stars
1,140 ratings256 reviews
How item rating is calculated
  1. 5 stars69% (791)
  2. 4 stars11% (127)
  3. 3 stars7% (77)
  4. 2 stars4% (40)
  5. 1 star9% (105)

Reviews summary

Pros

  • : Straw and lid can be removed for cleaning.
  • : Ideal for carrying and fitting in cup holders.
  • : 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.
  • : The lid seals well but is hard to unscrew and can block straw flow.
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Showing 1-3 of 256 reviews

Jan 15, 2026
Reviewer name: Mikeymom
Top Reviewer
Item details
Color: Blue
5 out of 5 stars
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
Jun 9, 2025
Reviewer name: Charlotte
Top Reviewer
Item details
Color: Blue
5 out of 5 stars
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
Apr 12, 2026
Reviewer name: T
Top Reviewer
Item details
Color: Pink
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

while I absolutely love these, there should be a note somewhere about how to take the lid apart to clean because like the little air intake gauge mold can grow there and there needs to be like a pack of replacements for the lid made. other than that it keeps my drinks cold for a really long time

Helpful?1XBPWO68IP4C13453350769
Current price is $9.97
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