Guitar humidifier that protects the guitar even in the driest conditions: using a specialized hydrophilic sponge that holds 12x its dry weight in water (much more than ordinary sponge), it allows for longer periods between re-fills and increases protection in drier environments. Guarding against cracks, warped necks, and shrinkage is now easier and less work preserving the instruments ultimate playability. Suspended by the strings, the humidifier releases moisture evenly and slowly inside the guitar, yet never touches the guitar’s body. The humidifiers stopper allows user u to check the sponge status without removal of the unit and provides a tight seal when in place. Maintaining the humidifier is as easy as moistening the sponge when it becomes dry.