Humydry Moisture Absorber 3 Pack Refills contain 3 unscented bags with 8.8 oz. of crystals that absorb excess moisture. The refills must always be used in a container such as the Humydry Compact Moisture Absorber 8.8 oz. or the Humydry Premium Moisture Absorber 15.9 oz. The use of our moisture absorbers helps reduce excess humidity and creates a fresher healthier environment at your home. Designed to allow 360 airflows to attract moisture faster. The continuous use of Humydry moisture absorbers prevents and solves problems caused by excessive humidity such as condensation musty odors rust or damaged leather clothes or shoes etc. Our products absorb moisture from the atmosphere until the recommended relative humidity level of 50-60% is reached. The hygroscopic crystals in the refill transform excess moisture into a liquid that is collected at the bottom of the unit. As soon as the refill is opened and placed on the filter the granules will activate and become more compact as they absorb moisture. Once they are saturated the liquid will start to drip into the bottom tray.