Ben Marko wrote:I thought something that would allow air movement but block moisture would be good
that's kind of a tall order. of the molecules that make up the air around us,
water is among the smaller. nitrogen, oxygen, and
carbon dioxide are all quite a bit larger. water does have some chemical properties that make it behave differently from those others and might allow a barrier that prevents the movement of water while allowing the others. I don't know of any that are readily available, and I'm not sure what good that would do you if you did find something. allowing oxygen in, for example, would degrade your herbs. and any water impermeable barrier will keep any moisture in just as well as it keeps moisture out.