Different consumers have different consumption rates are why the soda comes in all sizes of packaging.
12 oz cans are in 6 pk for light drinkers, 12 pack for heavier drinkers, 24 pk for even heavier drinkers and 30 pk for the heaviest users.
8 oz are for very light users, or to be used in a school lunch box as it is a good size for children.
16 oz cans are for poeple who drink a larger amount of soda and do not want to open 2 cans and throw out half of one of them.
20 oz are well largest profit item for bottlers and retailers.
you should be able to get the picture without having to go thru the rest of the list of sizes.
If what you did yesterday still looks big, you haven't done much today.