[Country101]

Cool and dry is always good. Humidity doesnt go good with powders and primers. I figure anything that seals air tight ought to be good if it is not too permeable and you seal it while in low humidity.

I would think what you are talking about would work, but I dont know all that much about them.

Something that wouldnt sweat much if the temp changes would be good. And if it is going to be moved around(ie changing altitude and such) a pressure release valve wouldnt be a bad idea. Kinda like the gun boxes Pelican makes. That way when the pressure builds up it vents and you have less chance of any moisture condensating.