Did you read it already? It is not a joke: it is like a condom to be unrolled on the top of the bottle to preserve our wine.

it is an idea of Americans who also used an ironic slogan “Wine Condom: protection for wine lovers”!

It is amazing: you can keep it in a pocket and it does not create any further space as you have when putting back the cork on the top of the bottle that, yet, does not fit anymore!