These charcoal bags can absorb excess moisture to prevent mold, mildew, and bacteria from forming on your clothes, shoes, and in your bag. To re-charge them, just stick 'em out in the sun for a bit.
Promising review: "I bought these to use in my car. We have been going to play in a river a lot lately, and after a few weekends of the family being in the car with damp clothes, and water shoes, my little Hyundai has started to smell bad. I am a big Ozium user, and even the Ozium didn't permanently rid the car of the sour smell that had developed it. I placed a charcoal bag on the floor in the front, one on the floor in the back, and one in the trunk after coming home Saturday after another day playing in the river. I did not use the car again until Monday morning. When I got in the car, I noticed that the bad smells were gone. I didn't notice any chemical-like smell that I have noticed with some other charcoal filters. All I could smell was my not-so-strong air freshener! So far I am very happy with these, and will be buying more to place in my home office, and some other areas of the house!" —George
Get a set of two from Amazon for $8.99.