So not only is the machine unnecessary, you can drink from the bag?

It's the SV version of a Capri Sun?

Here's a video of the insides of a bag: https://vimeo.com/214030931

That's exactly what it is.

It sounds like the chunks that have to be later pressed is to present the illusion of freshness. If one wants juice, why can't one have the juice fully "pressed" at the factory, if they insist on the juice being extracted by pressing, and just pour the juice into their cup? (Or have a drinkable pouch, maybe like what is available for baby food, now)

I was wondering that myself. Root vegetables like carrots and beets would be really difficult to press by hand.