Ramune Codd Neck Bottles

How have I gone through life and never encountered one of these before? The bottle is sealed with a marble held in place by the carbonation. Pretty unique concept.

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Ramune is widely known for the distinctive design of its bottle, often called Codd-neck bottles after the inventor, Hiram Codd. They are made of glass and sealed with a marble; the codd head is held in place by the pressure of the carbonation in the drink. To open the bottle, a plastic device used to push the marble inward is provided. The marble is pushed inside the neck of the bottle where it rattles around while drinking. Therefore, the drinks are sometimes called "marble soda" outside Japan.[3] While the Codd-neck bottle was once commonly used for carbonated drinks, today Ramune, along with Banta, is one of its very few users.

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