From the manufacturer:
Some of the many benefits of Musik Tent: Low Maintenance – refill about once or twice a year rather than constantly recharging sponges or beads or room humidifiers, Low Cost – no expensive pouches or room/home humidifiers, No Smells – room humidifiers leave a musty smell and film on surfaces, Visible and Available – instruments are displayed and easily/quickly accessible rather than hidden away in a case and capos/straps/tunes don’t need to be removed, and It Works – maintains instruments at the desired humidity year round.