What's a Gallon?

In America, we know gallons.
We by gas by the gallon.
We buy milk by the gallon.
We get Gallon cans of paint.
We have 5 gallon buckets.

Ya know what you can by here by the gallon?

I really have no clue. In the last two years I have never purchased anything by the gallon.
We buy out PETROL by the litre.
The largest milk we can get:

That's six pints....I will do the math for you.
2 pints in a quart. 4 quarts in a gallon. 8 pints in a gallon.
So for whatever reason, they don't like to give you those 2 extra pints of milk... which when you have two kids drinking 8 cups of milk a day...you really wish you could by a gallon of milk.
I think, the reason they don't have bigger jugs of milk, is that it wouldn't fit in the normal refrigerators sold here. 
Most homes don't have room for a full size fridge, they use the small college size fridges with a little ice box at the top.
Fridge Freezers such as this one:
 
like what we have are so much better, but still...not a lot of room for a gallon of milk as you can see, however, those skinny little milk jugs fit quite nicely in the door.
It takes a bit of practice to be able to pour from one though... for about a year I spilled milk every time I went to pour milk into a cup or bottle, and I feel like I'm a relatively graceful person having mastered the gross and fine motor skills some years ago...