no he is asking how come there is no need to produce the tin, that the goods are put into.
since canned soup is normally put into a tin can, while cola is put into a aliminum can so maybe tin has not been put into the game and will be implemented later on into the system.
I thought he was asking if it is required or not. However that is very true that packaging materials should be implemented in the game to make it more realistic, such as cans, bottles, boxes.