I used to have 3 sizes of glass coke bottles (still do), a 250ml plastic bottle, a 500ml plastic one, a one-litre one from poland, a 1.25 litre one, a 1.5 litre one, and i once saw but couldn't buy a 2-litre one that was the same shape as a 500ml standard bottle i got rid of the plastic ones, but 1-litre is the best size for coke to be honest, 500ml isn't enough oh, if you're a real avid coke collector, you want to try and get your hands on some 'new' coke, or coke 2, which was coke's flop attempt to make a new recipe to compete better with pepsi