Which, by the way, some people believe in and some do not. I am not sure where I stand on the air transfer theory. I do know that no matter how long my wine sits in bulk with an airlock, it gets no better or no worse, but it sure helps to be sure the wine remains still and clear. I also know that when I bottle my wine with corks or with caps, it goes through that wonderful mellowing process of aging. Equally, I am not sure of. How do I prefer to bottle my wine? In 750 ml corked bottles. That is my 2 cents worth of opinion.