Coravin

If you think about it, opening a wine bottle basically forces you to finish the whole thing within a few days, lest it oxidizes and acquires an unpleasant taste. Coravin solves this problem in an ingenious manner: instead of pulling out the cork, this elegant device inserts a thin, hollow needle right through it to gain access to the wine, then pumps in argon (a non-toxic inert gas already present in the air) in stead of oxygen to fill in the void and keep from oxidizing the stuff. The cork naturally reseals itself upon pulling Coravin’s needle out, meaning you can essentially grab a glass from any bottle in your collection without any further commitment and easily save the rest for later.

Learn more at Coravin or Amazon (refills here) – $300