Since I'm waiting on lights to come on, I'll extrapolate... I have lost a few jars of weed to mold when I wasn't meticulous. I hate to waste 4 months growing something to have to toss it after a few weeks in a jar? I peroxide wash everything like Jorge Cervantes says, even if I don't have PM. It's more of a preventive measure since I'll have my weed around for a bit. If I can't fit the plant in the little cannister I just vacuum seal the mason jars - same effect, but not as easy to air out.
Vacuuming it opens the buds up and lets that inner moisture get out and 'equalize' in the bud.
I have had the first vacuuming make them feel green and moist again, so they go back on a drying tray.
I have also had it gain over a half a gram/oz in weight 'rehydrating' with the packs.
After smoking both, I prefer the stuff that was a little over-dry hanging, And it won't give you mold problems.