It's for cigarillos. It uses about 0.25 litres of the volume which is ok
Is it really called just flask? :D
Yes. You could use more descriptive words. For example it could be a “a leather bound flask with built in cigarette case”, but ultimately it is still a flask.
here is an example on Amazonwww.amazon.com/.../B009M7M0L4
Some people might call them drinking flasks, hip flasks, whiskey flask, etc.
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