Ramune is a very popular soft drink during warm festival days and nights (and this year has been the hottest summer on record). It has a unique iconic design, with a Codd-neck (named after the inventor, Hiram Codd) bottle and a glass marble to seal the top of the bottle (pushed down into the bottle to open).
Ramune is also available in plastic PET and can bottles as shown in the picture below.
A short YouTube video showing how to open a ramune bottle.
Today, ramune comes in many different flavors and can be found outside Japan.