Whether you are using a guitar that is laminate or a solid piece of wood...this is truly your acoustic guitar's best friend. This is a two way humidification system. It puts moisture out, and it takes moisture in when there is too much. This is the ultimate set-and-forget system out there. You put to packs in the soundhole and one under the headstock(in a case or gig bag of course) while you're not playing and it does its thing. Too many times have I forgot to fill the tube or dampen the sponge that comes with other humidifiers. The packs also last for months! This is truly the best you'll buy!