It really works:) & hopefully will last several months
I put two of these into 2 different closets that are rarely opened/closed and had a slight damp/musty smell, and I'm happy to report that the smell is completely gone from both closets and the seasonal clothing that was in the closets. I only needed to use ONE charcoal bag per closet. Hopefully, it's odor absorbing abilities will last several months, because there's not enough sunshine in the winter time to recharge them.