Use our silica gel desiccant 10g packets to protect your coins from moisture damage in enclosed storage spaces. Most damage to stored valuables and supplies is caused by trapped humidity. Humidity turns into almost imperceptible condensation which causes irreparable damage. Desiccants prevent moisture related problems before they begin. (Manufacturers know this. That's why they often include a small packet in shipments.) Desiccants create a protective shield of dry air within any enclosed storage area. These anti-moisture packets act like a dehumidifier that doesn't need to use any electricity.