Ideally I'm looking for an insulated bike bottle to hold hot beverages for long winter rides.

It should have a proper groove like a bike bottle, to fit the lip in a bottle cage so that it does not eject. It should also have a proper valve for drinking while riding.

Not really looking for a generic flask that will eject from a bottle cage or something that requires stopping to be able to drink.

I am aware of the CamelBak and Polar products. The Polar has slightly more of a groove than does the Camelbak which is lacking. How well do these work for insulating hot beverages as opposed to cold?

And it should actually work, should keep a hot beverage hot for at least a couple or three hours or more.


-Tim-