Hmm… seems the lid on the ceramic “paper cup” I got is not making as good a seal as I thought, seems leaky now.
Sigh – great design, but looks like the functionality’s not all there.
The quest for a decent cup continues.
I’ve seen some travel mugs that have a cover that flips up on a hinge, I might try one of those next.
The ones that have a cover that slides tend to get gunk under the sliding part, so perhaps the flip-top is the answer…