Concrobium Moisture Grabbers are a desiccant product designed to protect surfaces and possessions against moisture damage, musty odors, rust, and corrosion. As they absorb moisture, Concrobium Moisture Grabbers stay dry pouches will expand and will take on a gel-like consistency. When the pouch feels heavy and saturated with water, discard in the trash and replace. Recommended ForDamp, musty areas, such as basements and crawlspaces, and for areas that can trap humidity such as attics and garages. Concrobium Moisture Grabbers can even be used after flood damage for longer term moisture management. The easy-to-place design makes them perfect for moisture control in recreational vehicles such as boats and RVs. Effective for spaces up to 1000 cubic feet.• Three 17.5-oz. hanging bags• Traps moisture• Reduces musty odors• Helps freshen air• Fragrance-free When pouch feels heavy and saturated with water just discard and replace Perfect for moisture control in boats or RVs Effective for spaces up to 1000 cu. ft. | Moisture Grabbers, 3-Pack Hanging Bags