You mean this is not standard practice around the world?
Well, this special practice we did not know.
It did not come to our mind - we held it more the way of how most TV-viewers use the commercial breaks to re-provision for the next half hour
. So, we have been going below searching the lockers for chocolate bars or cookies while on watch, disturbing the off watch and then eating the whole thing... and the same procedure again an hour later...
Systematically preparing a watertight box we took with us in the cockpit with many small
goodies (and not just sweets) was new and much more practical.