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 conceptsWhy 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, SolihullSend new questions to nq@theguardian.com. Continue reading...