Great site!

The one I use looks exactly like this one on there, but mine is from Nissan instead of Thermos:


(No direct links, # JMQ400P)

Closes so securely I can safely toss it in a bag, but more importantly, fits in a standard water bottle cage. No sipping feature though, you have to unscrew the cap to drink, but that's why it closes so securely. Keeps things warm for a long time.