Single Pack protects 2 cubic feet.

This desiccant is most effective when it is used in multiples scattered evenly throughout the safe, tool box, drawer, safety deposit box, etc.Use the clay desiccant to protect your coins from moisture damage This desiccant is most effective when it is used in multiples scattered evenly throughout the safe, tool box, drawer, safety deposit box. Desiccants create a protective shield of dry air within any enclosed storage area.