We still have the pottle, but we call it a half gallon...
Ohhh...Now you've hit the Metric minefield.
Half a Gallon would now be sold as Two Litres.
Milk is sold as: Pint(454ml) , 2pint (908ml) ,2Litre (4.1Pints). Other sizes are available.
Seriously, it is that messed up.
Beer by the Pint and Wine by the litre.