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

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

1,157 ratings
Mainstays 20 oz Stainless Steel Double-Wall Tumbler with Straw Lid, BlueMainstays 20 fl oz Stainless Steel Double Wall Tumbler Straw Lid Blue ColorMainstays 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

Key item features

  • Ready-use Accessories: Includes a straw lid and two straws for ready-to-use convenience. The unique four-way threaded lid allows for customized straw placement, promoting a more natural feel in hand.
  • Effortless Cleaning: Designed with a wide-mouth opening for easier cleaning between uses. The entire tumbler is also dishwasher safe, ensuring simple and convenient everyday care.
  • Durable Insulation: Constructed from 18/8 stainless steel with double-wall vacuum insulation, this design helps keep both hot and cold drinks at the desired temperature while offering a sturdy, reusable feel.
  • Enhanced Portability: Features an ergonomic handle for comfortable carrying and a shape that fits standard cupholders, making it easy to transport from car to desk or workout.
  • Modern Appearance: This 20 oz capacity tumbler is finished in blue, contributing a clean, modern look to its overall design.
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Customer ratings & reviews

4.3 out of 5 stars
stars
1,157 ratings259 reviews
How item rating is calculated
  1. 5 stars69% (803)
  2. 4 stars11% (129)
  3. 3 stars7% (77)
  4. 2 stars4% (42)
  5. 1 star9% (106)

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.
  • : 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 259 reviews

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?1XBPWO68IP4C13478860878
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?1XBPWO68IP4C13478860878
Sep 28, 2025
Reviewer name: Susan
Top Reviewer
Item details
Color: Blue
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

This is one of the best thermal cups that I own I've bought two of them in blue and green and they are what I drink out of every day and my drink stays cold exactly like it's supposed to I love both of my thermal cups and I love the way the lid just screws on and stays where I put it

Helpful?1XBPWO68IP4C13478860878
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