The flask has a capacity of 900 ml, or 600 lying down - so phlegm samples are out, wee is in. Still not sure if this one is for traveling, for bed use or for coach trips - but the function seems to be unquestioned.
Still I wonder, did m'lady open the coach window to empty the contents on innocent paupers, or stopper it for later disposal? You must admit, as a topic it has great potential.
JP stay off the gravy, stick to Bisto.