That's also why our GI canteens are smaller than the British ones (our quart is smaller)
The "cup" as a unit of measurement is hardly ever used here - never has been really. We used to use pints, half pints etc. Our canteen is a 1 litre canteen, which is only a little bigger than a US quart (1 US Quart = 943 mls). Fluids are traded in litres here and have been for a long time. People talk about mpg, but it's nostalgia, you cant buy a gallon of anything from anywhere - with the singular exception of beer, which by law must be sold in imperial measures. We resisted metrication, but it's inevitable. The US will go metric too eventually. It doesnt make sense in a global market to have multiple units for weights and measures and the metric system is much simpler and more logical. You get used to it eventually.
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