Mainstays 40oz Black Diamond Pattern Tumbler Stainless Steel Double Wall
Mainstays 40oz Black Diamond Pattern Tumbler Stainless Steel Double Wall
Hero image 0 of Mainstays 40oz Black Diamond Pattern Tumbler Stainless Steel Double Wall, 0 of 5
Mainstays

Mainstays 40oz Black Diamond Pattern Tumbler Stainless Steel Double Wall

Mainstays 40oz Black Diamond Pattern Tumbler Stainless Steel Double WallMainstays 40 fl oz Stainless Steel Double Wall Tumbler 2 in 1 Lid 3D BlackMainstays 40 fl oz Stainless Steel Double Wall Tumbler 2 in 1 Lid 3D Purple
Actual Color:Black-Out of stock

Key item features

  • All-Day Cold: The double-wall vacuum insulation and durable 18/8 stainless steel construction keep drinks ice cold for several hours.
  • Durable Handle: This travel mug features a handle, making it easy to drink from.
  • Convenient Size: The 40 oz mug fits in most cupholders, perfect for use in the car or on exercise equipment.
  • Easy Cleaning: The wide mouth design is easy to clean and dishwasher safe.
  • Modern Aesthetics: The 3D diamond pattern provides a textured, stylish look.
  • Included Straw: Comes with a straw for convenient sipping.
  • Sleek Finish: Features a sleek black finish for a stylish appeal.
  • Eco-Friendly: Helps reduce plastic waste by offering a reusable option for beverages.
Generated by AI
Current price is $13.97
Price when purchased online
Out of stock

How do you want your item?

How do you want your item?
Out of stock

About this item

Product details

Specifications

Warranty

Warnings

Customer ratings & reviews

4.4 out of 5 stars
stars252 ratings129 reviews
How item rating is calculated
5.0
5.0
4.7
4.7
4.4
3.3
  1. 5 stars70% (176)
  2. 4 stars13% (34)
  3. 3 stars8% (19)
  4. 2 stars3% (8)
  5. 1 star6% (15)

Reviews summary

Pros

  • : Features various color options and a sleek design.
  • : Has a design and handle for comfortable transport.
  • : Made to withstand regular use.
  • : Holds 40 oz, perfect for daily hydration.
  • : Offers great quality at a lower cost.

Neutral

  • : Can be sturdy, but may have sealing issues.
Generated by AI

Customer photos

  • +136 images
Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
Sort by |

Showing 1-3 of 129 reviews

Feb 4, 2026
Walmart customer
Top Reviewer
Item details
Color: Blue
5 out of 5 stars review

Verified Purchase

very nice bigger than i thought.

Helpful?7IPQYNNB2MWW15001761367
Feb 15, 2026
Melanie
Item details
Color: Pink
4 out of 5 stars review

Verified Purchase

The color is pretty; the tumbler itself is very light; the pieces on the lid are removable for easy cleaning. I use ice all the time, especially at bedtime for my water. There was still ice in the cup come morning. It is a good tumbler for the price.

Helpful?7IPQYNNB2MWW15001761367
Apr 18, 2026
Rose
Item details
Color: Blue
4 out of 5 stars review

Verified Purchase

when it arrived the straw was broken. My other straws do not work.

Helpful?7IPQYNNB2MWW15001761367