This Mainstays tumbler is a 20 oz stainless steel cup made for drinks on the go. Double-wall vacuum insulation helps keep hot or cold beverages at the right temperature for hours. The ergonomic handle gives you a comfortable hold, while the cupholder-friendly shape makes it easy to bring along in the car or during travel. A four-way threaded straw lid lets you adjust the straw position to suit your drinking hand preference, and the black finish gives it a clean, modern look.
First impressions
- Availability through a retailer shoppers already trust.
- A feature set that covers routine use without unnecessary complexity.
- Bundle and accessory options that extend usefulness over time.
Owner feedback on Walmart
On Walmart.com, this item shows an average customer rating of 4.3 out of 5 based on 1,171 customer ratings as of October 14, 2026. Ratings are provided by Walmart and may change on the retailer site.
Who benefits most
Anyone treating this as a practical home & kitchen purchase and wants realistic expectations from Walmart.
What impressed us
- Good value when you do not need flagship extras.
- Helpful owner community and searchable troubleshooting tips.
- Useful for households upgrading from an older model.
Potential drawbacks
- Verify compatibility with devices or rooms you already own.
- If you need pro-level performance, compare higher tiers first.
- Review return policies before gifting or buying open-box.
What Walmart lists it for
Walmart listed this item at approximately $9.97 as of October 14, 2026. Prices and promotions change frequently. If the price shown here differs from Walmart.com, the price on Walmart.com governs.
Wrap-up
We would consider Mainstays 20 Fl Oz Stainless Steel Double Wall Tumbler Straw Lid Black Color a practical option given its Walmart ratings; Walmart.com always governs live pricing.
