Vacuvins don’t maintain enough of a pressure differential to make a difference. It’s not like you are pulling a hard vacuum and maintaining it. At best you redu

Vacuvins don’t maintain enough of a pressure differential to make a difference. It’s not like you are pulling a hard vacuum and maintaining it. At best you reduce the amount of O2 by a relatively small fraction. As others have stated, losing more volatile aromas into the head space of the bottle is the larger consequence of these devices.