So how to mount a holder for the new, extra-wide insulated mug on my handlebars…? It's substantially wider than a regular waterbottle. Most hot-beverage holders for bikes are rings with a bit of taper, as if for a papercup of coffee, and the KK mug is perfectly cylindrical – not a good match. @KleanKanteen on twitter could offer me no help, except some advice to use rubberbands to keep it from dropping through…!
The insulated mug is bigger than most bike bottle cages – despite the photo on the company website showing someone's tea in such a holder – making it a tough and tight fit. You could shove it into a cheap aluminum open-front bottle cage – but do that ten times, and you’re looking at a very bashed-up mug, as metal grinds on metal.
Finally, I visited Valencia Cyclery and after poking around in their stock, the fellow there put this combo together for me (while insisting he was not a Bontrager company shill):
Bontrager RL Cage – a standard high-quality plastic waterbottle cage that’s open on the front and so more flexible, and Bontrager Waterbottle Handlebar Mount (plus a couple of screws to connect them). It ran me twenty bucks, but I was happy to get the human intelligence too.
I connected the two items with an allen wrench (don’t ask me the size). And mounted it on my handle bars, also with an allen wrench.