They are air tight for a long time plus they have a drying agent in them to
suck up moisture for a while if they do leak.


"dean" wrote in message
oups.com...
Are they air tight? I mean, even after several years they still don't
get misted up inside, but I can't imagine how (with all the cold and
warm contractions and expansion) they ever manage not to leak somehow?
Am I missing some kind of magic here?

TIA!

Dean