Keep the interior of your car dry with these dehumidifier bags which absorb excess moisture and naturally purify the air helping to remove musty odours and keep windscreens mist free fragrance free and non toxic the bags are completely safe containing 100 bamboo charcoal to treat an area of around 90sqft ideal too for caravans and boats that may be left unoccupied for long periods of time the bags can be rejuvenated from time to time by placing in sunlight when used up simply empty out