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Are there any beverage containers that can get smaller as they hold less fluid?

Asked by Ltryptophan (12091points) October 30th, 2021 from iPhone

Imagine a thermos designed to be easily shrunk down as the liquid contents are drank.

Not a bag style, like camel bak. More like a bottle with some sort of accordion diaphragmed sides.

Or, twisted smaller.

Or maybe, a bag inside but the rigid outer part telescopes down as it dispenses.

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