D'Addario Humidipak PW-HPK-01 Two-Way Humidification System


88 out of 100. Incorporating 2550+ ratings and reviews.

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D'Addario Humidipak PW-HPK-01 Two-Way Humidification System

Gearank Recommendation

The Humidipak PW-HPK-01 appeared on our recommended list for Guitar Humidifiers from February 2017 until January 2022 when it was removed due to being out-ranked by other options.


The D'Addario Two-way Humidification System is a maintenance-free in-case humidifier that does away with the usual sponge and water system.

It is designed to provide 2-way humidity control, increasing or reducing the moisture as needed to maintain around 45% humidity level.

And it does all this without the need for maintenance and water refills, the downside being the need to replace the included pouches every 2 to 4 months.


  • Weight: 1.28 oz
  • Suspension: Packets are placed in Nylon pouches that you place in the soundhole and near the headstock
  • Longevity: Short
Although this was previously on our recommended list, there are now more highly rated options available which you can see in our guide to The Best Guitar Humidifiers & Case Hygrometers.

About the Author

Alexander BrionesAlexander Briones

I have been writing about and researching music gear for many years, all while serving as a music director at my local church. I engage in guitar playing and singer-songwriter stints, in addition to mentoring young musicians and teaching guitar and bass.