Yep, a vacuum is pulled on the receiving vessel.The AIO draws a vacuum on the bottle being filled?
Never tried bottling wine in plastic. Although...a good way to tell if you have potential bottle-bombs due to incomplete or restarted ferm w/ f-pac would be to fill a small soda bottle with wine, squeeze out all of the air and twist on a cap. If after a week or so the bottle inflates with CO2, better handle the glass bottles with caution! :<Couldn't use the All in One because I was using some plastic bottles.