They made a really loud noise in the lunchroom if you inflated the pouch all the way, folded over the straw to seal it, then stomped on it really hard with your shoe. This was before mentally deranged people started shooting up schools though, so maybe don't try it.
They have these revolutionary containers made from paper that is layered in order to make it hard and card like. Almost stiff as a board. And is capable of holding liquids and also breaks down very easily. 😒
Unironically, there's a technique to it. I forgot how after I got older, and was genuinely frustrated trying to drink from one until I remembered how to do it.