Coke bottle sizes

They play around with the sizes. You will get to a shop and they have 3 different sizes, but they are all the same price. OR like the other day I got a 2 litre Fanta. The bottle is tall; looks like a 2.25 litre. When I looked closely however I saw that is was narrow at the bottom half and actually only a 2 litre. I feel like Coke is trying to trick us.