There was a thread recently where I think these got a lot of praise:
https://www.rei.com/product/884337/gsi-outdoors-infinity-backpacker-mug
My issue with single wall Ti is that they cool coffee from boiling to cold in what seems to be about 30 sec. I tried several times to like a Snow Peak before realizing I had purchased a really expensive way to burn my fingers and drink cold coffee. Wasn't actually any lighter that the $3 plastic one either.
Yk