That's a vacuum bag. We used them in school for clamping down odd shaped laminations. Not only is there no air in there, you wouldn't be able to expand your diaphragm if you could. The pressure they develop is immense.
A few years ago there was (probably the same guy) a Japanese porn fetish thing with vacuum bags.
I swear, the Japanese need to get off their island more.
eta
I just watched the video in the link. It's not the same thing as we used in school, this has much less vacuum.
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