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"ordering another 10,000 toilet rolls" You laugh, but in The Ship with the Flat Tire (https://www.goodreads.com/en/book/show/18001514-the-ship-with-the-flat-tire), the Supply Officer (a fresh Ensign) orders a certain quantity of TP, because his Chief thinks the unit of issue is the roll. Turns out the unit is the case--something like 100 rolls per case. When it arrives, they have trouble finding places on board to stow it. But as you might guess, it saves the ship later on.