I probably shouldn't comment in this thread because, as a tea drinker, I've never made or drunk coffee on a canoe trip and, unlike Robert Duvall's classic Colonel Kilgore, I dislike the smell of it in the morning. However, I think it's on topic to respond to the first two sentences in the OP.
I have never understood the allure of a metal coffee cup. David Brower’s decade’s long use of his “iconic” Sierra cup left me wondering “why”?
When I began serious whitewater canoeing in 1979 in northern California, I joined the Sierra Club and immediately got a Sierra cup.
HERE is some official history of the iconic device. I suppose I used it a few times for something, but never could understand its functional virtue. They said is was stackable, but so what! Who carries a stack of Sierra cups?
For everything else it seems inferior. The metal burns your lip and the metal handle can even get too hot. The narrow base makes it tippy to put down on the ground. The wide mouth makes heat and liquid evaporate faster, and so does the lack of a closed top. It doesn't have much volume. Yeah, you can scoop water out of a Sierra Nevada stream, but you can do that with anything including your cupped hand. I suppose my Sierra cup is lost somewhere in that cathedral of entropy known as my basement, along with other discarded paraphernalia from my naïf days, such as my custom made canoe cover and Carlisle clubs . . . er . . . paddles.
HERE is my post from 2016 picturing and describing my favorite cup for both vehicle and canoe tripping for more than a decade.