[Garycw]

Plastic bags could actually trap moisture/ humidity IMO. Wether you use or don't use plastic bags I think a desiccant is a good idea, even in ammo cans. If you want to make your own they sell Dri Splender at hobby lobby. I made a bunch of them with #6 coffee filters. I cut a clear strip in them and sealed with clear packing tape. This leaves a small window to see if the indicating crystals change from blue to pink. If pink, they've adsorbed as much as possible and can recharge them in microwave or low temp oven a few minutes. Good as new!