Boveda 4-gram packs are appropriate for smaller storage spaces, like pill jars and bags. Boveda is engineered to maintain a precise relative humidity (RH) in an enclosed space. This 4-gram size is available in 62 percent RH.
Each Boveda consists of a specially prepared saturated solution of purified water and natural salt. This saturated solution is contained within a water-vapour permeable reverse osmosis membrane. Within an enclosed container, Boveda maintains a predetermined level of RH by releasing or absorbing purified water vapour as needed through the membrane.
Boveda helps maintain precise RH in enclosed spaces.