XIKAR 2-way humidity control packets consist of a proprietary blend of natural salts and purified water enclosed in a semi-permeable reverse osmosis membrane.  They are guaranteed to provide a constant level of humidity that never fluctuates or cycles - preserving your cigar's natural oils and sugars, allowing them to improve with age.  The 320g pouch is designed for humidors of all sizes, ranging from 25 count to 150 count.  Multiple 320g packs can be mounted in even larger humidors and cabinet humidors.