Beer Balls were a method of marketing brew in a quantity smaller than a half keg, but much larger than a 2 liter. If I remember right they held about 2 gallons of the amber nectar. When a "real man" arrived at one of the parties of my youth…he brought a pair of the bright blue ‘Balls’ with him (pun intended)…I don’t remember how one got the beer to your cup, but I do seem to recall that drinking directly from the container was considered a ‘rowdy’ activity…and bad form for the more genteel set.