“PlatyPreserve is the best way to protect the taste of an opened bottle of wine by completely eliminating the presence of oxygen. While alternative methods might have you pump air out of the bottle or inject gas into the bottle- PlatyPreserve has you transfer your un-finished wine into an air tight reservoir to truly protect the taste of your wine so it may be enjoyed several days or even weeks later.” <link>

I can see how it works but I’m not sure I can be bothered frankly. I tend to use a Vacuvin or just finish the bottle. Wine doesn’t last that long in this place. It might be better positioned as a weight-saver for people wanting to take wine on walks, climbs or picnics.