Planet Waves HPK-01 Humidipak Humidity Control System for Acoustic Guitar

Plato once said “The excessive increase of anything causes a reaction in the opposite direction". Excess moisture and musical instruments don't mix. Neither do musical instruments survive with excess dryness.
The Patented Humidipak, from Planet Waves, is the world’s first true two-way humidity system for Guitar that maintains the optimum humidity level for wooden instruments: 48% relative humidity. The “two-way" system means that it actually emits or absorbs moisture as needed to maintain 48% relative humidity. The Humidipak is an automatic system that eliminates maintenance, guesswork and protects cherished instruments. Simply place the Humidipack packets into your guitar, shut the case and let it do the rest. The revolutionary Humidipak, Automatic Humidity Control System, makes all the necessary adjustments - without water, drips and mess.
Happiness comes from a balance of rhythm and harmony. Keep the rhythms and harmonies harmonious with Planet Waves Humidipak. It's the care your acoustic guitar needs when it's alone.