Boveda 2 Way Humidity Control
The 67-gram packs are the appropriate size for enclosed spaces, like mason jars and large bags.
Each Boveda consists of a specially prepared saturated solution of pure water and natural salt. This saturated solution is contained within a water-vapor permeable “reverse osmosis” membrane.
Within and enclosed container, Boveda maintains a predetermined level of relative humidity by releasing or absorbing purified water vapor as needed through the membrane.
Available at: The Boveda Store