Markie, did you steal Lulu's password again?
The other reason some foods stay fresher in air tight containers is that the moistures don't evaporate out of the foods as easily.
I agree about the bread bins/boxes. In fact, I almost bought one years ago until I noticed that my bread just got moldy much faster. That's when I decided, it's back to the refrigorater for mine. I don't go through bread fast enough to keep it out for more than a day or two and I can't stand that horrid white bread that is tasteless and loaded with lots of extra preservatives.