I had a little look, but couldn't see my favourite - Codd-neck bottles that used an internal marble as a sealing mechanism for fizzy drinks. They're quite rare as children used to break them to obtain the marbles.

https://en.wikipedia.org/wiki/Codd-neck_bottle

(I used to believe that the old term "codswallop" was derived from those bottles as you'd give them a wallop to dislodge the marble. However, it looks like Hancock's Half-Hour from 1959 is the first recorded usage of it which wouldn't fit with the usage of Codd bottles)