Boveda 58% / 320g PouchBOVEDA Two way Humidity Control provides hassle free maintenance for ALL size humidors. Within an enclosed container, BOVEDA Two way Humidity Control monitors the ambient RH (relative humidity) and adds or removes moisture to maintain the specific RH engineered into the pack. Since its impossible to humidify beyond the RH on the pack, its impossible to use too much. Every BOVEDA Two way Humidity Control RH is accurate to + 1% in an airtight