Humidipak is the world’s first patented 2-way humidity control system which allows a constant adjustment of climate. Humidipak responds and adjusts to inside and outside temperatures in order to maintain a 62% relative humidity (RH) level - keeping your products fresh! Humidipak is natural, safe and environmentally friendly which contains natural elements such as salt and pure water. Once the Humidipak solidifies and starts to feel granular, please replace it. For best results replace your Humidipak between 60 to 90 days.