Moisture absorbing packets refer to any substance that absorbs moisture from the air, also known as a desiccant. Moisture Absorber is a solid substance that adsorbs water vapor from the air, also known as a solid desiccant. It is often made into dehumidifier bag, dehumidifier box. The porous material with a large surface area absorbs the moisture of the air under surface adsorption and capillary condensation. Since the partial pressure of water vapor on the surface of the solid moisture absorbent is lower than the partial pressure of water vapor in the air, the moisture in the air is absorbed to achieve the purpose of dehumidifying the air. We also have silica gel dehumidifier bag. Car dehumidifier bagoffers a quick and easy way to remove and eliminate dampness from your car, caravan, RV and boat. It is your best choice against fogged up windshields and other moisture related problems.