Interesting soup container made from bamboo

Watching this anime series and the main character, Rakka, receives pea soup from the man at a restaurant in a container made from a segment of bamboo. I wonder if such containers actually exist or if it is merely a creation of the artists for this scene?  It seems like there would need to be a seal around the lip of the container for it to actually work without leaking although perhaps bamboo itself is sufficiently resilient to be able to seal liquids.

It might be better to keep the cylinder intact, open one end, and place a cap on it à la a thermos. But then again it wouldn’t have quite the same, quaint effect in the animation as does the above design.