Missus bought me one a while ago - a little pressie . God knows what I had done right?
First thing, take indelible felt marker and write MOLEY (or possibly WHEEZE ) on mug - the writing sticks like **** to a blanket and doesn't shift in wet or heat, ensuring nobody: 'Picks it up by mistake' .
You can put the mug direct onto the cooker and heat water (for hot drink) in it, negating need for extra pan if you are going solo. Heat water in mug, add to dehydrated meat (yuk). Heat more water in mug = hot drink. Can't do that with a bloody orinoko foldy plastic ding-dong .