What size???

I have a to go mug for my tea that is 14oz, I think if it were 12oz it would be better.

I like 16 because then its twice the usual 8oz in a mug. Makes judging tea to go in to it easier. As long as it stays warm

16 oz definitely. All these odd 12 oz and such mugs are troublesome and annoying to get the tea ratio right. 16 oz is perfect, both in ease of measuring and in the amount of tea to drink from it!

Maybe the problem with mine is my mug – the tea gets cold long before I can drink it all!

at least a 10 oz. cup.

16 definitely, but would love 24!!! No one has a 24 out there.

12 or 16 for me.

16 oz. Easy to measure, and just enough for waking me up. ;)

16oz! makes it easy for baristas to measure as well, in those rare cases when I buy tea to go.
Plus, I get more tea! since I can’t go home and make more if I am out and about

16 for sure, I like 12oz at home but love 16 on the go!