i have a collection of about 10 1-liter fliptops, i usually use two per bottled batch and dont usually give them out to friends. if im giving them out i usually give a sixer of 12s
I have 12 & 22 oz. bottles that I use. I like the 12oz. bottles because if someone doesn't particularly care for it, or just doesn't finish it, then it is not such a waste. I drink the 22oz.'s when I know I will be having a beer or 10.
I also don't care to give samples of my brew in the 22's because sometimes people forget to return the bottle and then your out a 22oz. bottle, its alot easier to replace a 12oz. bottle.