Funny thing that Alex and I discovered right away after we moved to Mississauga, Ontario: Milk is sold in plastic bags here. Actually, it's a plastic bag filled with 3 individual baggies of slightly less than a quart each (Don't ask me what's that in litres. I'm working on one thing at a time; and it's the outside temperature in Celsius, and how fast 60 kilometers per hour is, that are the more pressing things for me to get used to right now.). Anyway, what you do is, you buy this scary plastic bag of milk (like a huge water balloon, that you must hurriedly shove into your own shopping bags yourself at checkout. No baggers or free bags provided at grocery stores here.) and then when you get your plastic bag of milk home, you plop one of the mini baggies into a little plastic open-topped jug so that the top of it sticks up over the top edge of the jug, snip off one corner of the baggie, and pour. (There's a YouTube Video this charming young girl put together, which gives you a better idea. Oh, and she knows the litres too.)
Works pretty well; although, when you get to the end, it's a little messy when there isn't enough weight from the remaining milk to anchor the bag into the jug as securely. (That may be also due to the age and skill-level of the person pouring. Only time and further study can reveal all pertinent factors.) The advantages to this way of packaging milk seem to be that it's cheaper (you can also buy milk in cartons, but not as economically) and that the milk stays fresher longer (or at least, the expiration dates seem to be much further off than those I found on the cartons.)
So, there you go: Some worldly trivia with which to bedeck your conversations at that upcoming cocktail party.