The Music Nomad Humitar Acoustic Guitar Humidifier travels the land throughout ensuring acoustic instruments are kept in a pristine environment thanks to a unique sponge, dubbed the Humid-i-Bar, kept inside a rugged plastic casing. Capable of holding up to 10 times its weight in water, the sponge's material ensures months of consistent relative humidity that keeps the acoustic apple of your eye from shriveling. Sponge run out of water? Simply get it wet again and you're good to go.