The Moso Natural Air Purifying Bag helps users keep their RV fresh, dry and odor free. The bag is non-toxic, fragrance free and chemical free, being made from natural moso bamboo charcoal that can efficiently absorb smells, allergens and dangerous pollutants. It helps in removing mold, mildew and bacteria, and can be used for over 2 years. The beautifully stitched linen bag just needs to be kept in the sun for an hour every month to rejuvenate it.