I can't really guarantee this works but I figure if the pharmaceutical companies have faith in it, I'll try it. I store all of my reloads in 1 gallon jugs w/ resealable lids and I place 2 or 3 of the small silica packs that you find in aspirin bottles and what not in the jugs. Also put a couple in each container of powder. And lastly, being as I leave unused powder in my powder drop, I place one in there as well ( for this I actually use the silica pack out of Excedrin. It is in the hard plastic container as opposed to the paper packs. I've found that the hard cased type actually floats on top of the powder so you don't have to worry about it messing up measurements). One last thing, next time you're in a convenience store, go to the candy isle and look in the bottom of candy-filled toys, i.e. toy cars, clapping monkeys, kid sunglasses, etc. and you can find the larger silica packs. Like I said, don't know if this helps reduce moisture, but it can't really hurt.