PW-HPK-01 Humidity Control System, Humidifier. This is an automatic humidification system for acoustic guitars. A two-way system, which both emits and absorbs moisture and maintains a constant humidity of 45-50%. No extra care is needed or splashing with water. Once you've opened a bag, it lasts 2-6 months, depending on the humidity. With Planet Waves Humidipak, you minimize the risk of dry cracks. Especially worth thinking about in winter with our climate.
Recommended by leading guitar manufacturers such as Taylor et al. PW-HPK-01 is delivered with three moisture bags and a bag in which the moisture bags are placed. The bag is placed in the sound hole, hanging over the D and G strings. The third bag is conveniently placed at the top of the guitar head. Always store the guitar in its case when not in use. It feels the best about it.