I have one of these and it fits in a standard bottle cage rather well. Seals the coffee in damn well, too, and I've never had it splash on me once by accidentally opening. I have a 40-50 minute commute and in the winter (20-40 degrees fahrenheit) it stays very warm for at least the first half hour, but this time of year where it's 60+ in the mornings it's still quite warm when I get to work.

Stainless Steel Create-Your-Own Tumbler, 16 fl oz | Starbucks® Store

While it is snug, I still use the upright seat tube cage to reduce the chance of it getting ejected if I hit a bump/pothole/etc. And it tended to rattle a little in an aluminum cage so I switched to a Profile Design Nylon Kage that I pulled off my seatpost mounted tri rack.