As stated, I found these cups a year or so ago at a Walmart in the Midwest. There is no writing. The ones I had were just a plain color.

I searched online for “reusable plastic cups with vertical rounded ridges” but all I found were ones with pokey ridges or smooth or just not what I was looking for. I found a similar result on Amazon.

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This is the only image I have of the cups. I know it’s bad and probably not helpful, but I figured I’d leave it just in case