My most compact one consists of one of these.
http://www.bushcraftuk.com/forum/showthread.php?t=41559&page=2&p=541466#post541466
Tea, coffee, powdered milk (in plastic bags), a permanent match and a bit of PVC outer sleeving from a bit of mains cable (lip shield, ally gets HOT!) all live in the pot with the inverted burner stand.
In the recess above the bottom of the burner stand & under the lid sit my fuel tablets & some cotton wool soaked in Vaseline. This is to stop the rattle of the fuel tabs & provide an alternative fire starter/means of fire with the flint & striker on the permanent match.
I only stopped carrying it a couple of years ago when I changed back to using my nested pots instead of mess tins & got a double walled insulated cup.