>
> Is it not the case that rubber is hundreds of times more permeable than
> either, and thus the degree to which a long-term storage wine oxidizes
> in the carboy is really not significantly altered by the vessel, since
> most of the permeation of O2 is going to occur through the rubber?

I don't recall seeing any study that would confirm your assertion.

If it is true, though... regard the surface area where the permeability
would occur. 3-4 square inches at a bung, or massively more over the
surface area of a carboy.

Kirk