OVERWRAPPED LARGE 67 GRAM PACKS LASTS 3 MONTHS IN MOST HUMIDORS. IN IDEAL AIR TIGHT CONDITIONS BOVEDA PACKS WORK FOR LONGER THAN ONE YEAR. 2-WAY HUMIDITY CONTROL, WITH ACCURACY OF +/-2% RH. HELPS TO CREATE CONDITIONS WHICH PREVENT GROWTH OF MOLD OR MILDEW. BOVEDA IS PERFECTLY STABLE ENVIRONMENT FOR THE STORAGE OF TOBACCO, WOODEN REEDS, FOOD AND HERBAL MEDICINE.