Bass Dampit Humidifier. Soak the flexible rubber tube in water and wring it out by hand. Then hang the damp tube inside the F-hole by its rubber washer. Don’t let it drip! Also works well for Cello. Protect your instrument from the dangers of Low Humidity by using a (well wrung out) dampit inside your bass gig bag. Remember: No dripping allowed by decree of Mrs. Lemur.