Original WWII ground dug Kaffee-Konserve tube. It is fairly beat up, dirty, faded and some of the text is missing. Still an interesting original example.
The only picture I have of this in use is the two Luftwaffe pilots slurping it directly from the tube, but it could also be used a spread. The only instructions on the tube say "for use by the first signs of tiredness" which seems to indicate direct use.
Full reproduction tubes available separately.