500ml to 440ml?
Edit: the 440 on the right, is the last of a can that I bought in a four pack. The 500 on the left, is one of three I bought as singles.
Packaged Guinness comes in 440 milliliters. Single cans of Guinness come in 500 mL.
Apparently, that’s how Guinness does it here in Canada.
And apparently, I lazily avoided any attempt to research or apply any level of critical thinking before posting.
440ml is a UK variant. No one has a confirmed explanation for its existence alongside 500ml.
However 440ml of water would be 0.44kg which is just under one pound imperial weight (0.45kg). Presumably the fluid plus the aluminium can would weight about 1lb which may explain the odd volume measure (given transport costs and possibly even how customs costs may have used to work?).