geigercntr
Miembro senior
According to th Milk the Funk wiki, it looks like it's probably just a cosmetic thing, but some folk reckon that aging beers with caps, you can get some off flavours that you don't get with cork (esp. acidic beers like lambics and the like).Remember back in the mists of time, beer bottles had a cork insert inside the caps, plastic wasn't invented then. I do wonder if this made a better seal?
Source: http://www.milkthefunk.com/wiki/Corking#Why_choose_to_cork_bottles.3F