First day with the insulated Klean Kanteen and i'm impressed. Kept my coffee nice and warm for 3 hours. Sides of the unit were cool to the touch (as you would expect) but did notice that the loop cap was warm when I was touching it. Definitly heat loss there but not too much to be a factor for myself.

I will test it out later night and see if I can get liquids to stay hot to the 6 hour mark as mentioned on their site. I can see this being realistic.

On another note, the form factor is awesome for the briefcase and it doens't leak at all (when you use the screw top lid). And it does a quick convert to a travel mug when you get the cafe cap.

Over all, highly recommend it.