Hardigg's Storm Case Desiccant Cartridge helps prevent condensation from occurring when a case is opened in high humidity areas. It absorbs and traps the moisture in the air; also helping to prevent mold, mildew and corrosion. The Desiccant Cartridge is completely reusable and has a convenient window to alert you when it needs recharging. Fits all Storm Case sizes. Order yours online... today!