I use the same bags that you do.

As far as "airing out", one of the major cel 
dealers (I don't remember which one) recommends 
snipping the corners off the cel bags, so that 
the cels can "breathe";  there's some concern 
about the decaying by-products of the paint 
harming the lines or the paint itself.  I've 
never done this, though.  Maybe I should...