Readers reply: why does tinned food come in a 400g can?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

Why do so many tinned foods – in Britain, at least – come in cylindrical 400g cans? Who decided that 400g is the perfect amount of beans/tomatoes/custard? Nanci Preston, Solihull

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