>> 50 kilos is the weight of a bag of coal.
>>
The weight of an old bag of coal - the long open-topped ones that grimey coal men would hump down off an open lorry and plod up the drive with and tip into the coal bunker.
Modern bags that you buy at garages are much smaller.
"Bags" of things have got much smaller. A bag of cement is only half the size of the old kind.
H&S I suppose.
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