If you don't go through the contents of your tobacco pouch within a few days, your pipe tobacco might dry out. But you won't have to worry about that with the Mini Disk Humidifier. It's a plastic disc that's ventilated and has a foam core. Just immerse it in distilled water for a minute or two, wipe it off, and drop it into your pouch. Now, your favorite blend will be good for around a week. It will also work well in a tobacco jar or a 12 to 14 oz. can.