Bamboo charcoal is an all-natural odor absorber. Great for travel, use as a car, closet, or gym bag deodorizer, bathroom and pet litter box areas too. Placing the activated bamboo charcoal bag in the sun for 30 minutes once a month naturally rejuvenates the charcoal by removing excess moisture - extending the life of these charcoal room odor absorbers for up to 2 years. Charcoal air purifiers are made from natural micro-porous activated bamboo charcoal. They clean the air naturally and help prevent mold and mildew by absorbing excess moisture, preventing the formation of airborne mildew known to trigger allergies and asthma.