Daddario Humidipak two way control system

Protect your guitar with these Humidipaks . They are a two-way humidity control packs which automatically maintain the ideal humidity level for your guitar. Use Humidipak Restore if your instrument is dry and needs additional moisture. Use Humidipak Absorb if you're in a high-humidity environment and need to lower your instrument's relative humidity. If your instrument is already at the proper relative humidity, Humidipak Maintain will sustain this level inside your case.