Dry-Packs 200gm Dehumidifying Box, Pack of 3 Dry-packs moisture absorbing dehumidifying boxes are made of sturdy corrugated carton Contents 100-percent white/clear silica gel are contained within a bag that can easily be reactivated Dry-packs moisture absorbing boxes come with a humidity indicator built right into the bottom of the box Reactivation instructions are printed right on the side of the box Electric free dehumidifier no cords - protects 15 cubic feet