There are several factors contributing to the growth of mold including warm temperatures, poor ventilation and high humidity. While charcoal bags do assist with humidity, we strongly recommend that the bag, anything stored inside it, as well as its surroundings, be thoroughly cleaned and disinfected after mold is observed. All our service packages include deep cleaning but do let us know if you are faced with a mold issue so we can pay special attention to it! After cleaning, the bag should also be stored in a cool area and brought out to use or air once a month. As charcoal bags absorb moisture, this may cause the leather to dry out so do pay attention to the leather condition and moisturise or restrict the length of time the charcoal bags are kept in the bag where needed.