Right, but I'd imagine you can conceptualize the 2l bottle of coke that you see in the supermarket - even if you don't buy it/drink it.
* 12 fl oz (355 mL) aluminum can
* 20 fl oz (591 mL) plastic bottle
* 2L plastic bottle
Depending on the brand and store availability I've also seen 12 fl oz glass bottles, 1L bottles, and sometimes smaller sized cans as pretty standard sizes. Other types of drinks (such as energy drinks) can vary in what containers they use.
In general, though, if you're buying soda for a family or for more than one drink/meal, you're going to be buying a 2L bottle (and refer to it as such).