I have a cup I bought from 7-11. It’s aluminum with a rotating closing no-spill top. It’s actually quite nice. Probably have passed hundreds of gallons of coffee through it over the years.
I have a stainless cup I got at Starbucks several years ago, but I seldom use it. The top comes off too easily.
The cup I liked was plastic, and I got it at 7-11, too. In fact, I ended up buying three of them, as I had them so long the tops broke, or the handles.