1. Product Overview
The D'Addario Humidipak Maintain Kit is a maintenance-free, two-way humidity control system designed to automatically maintain an optimal 45-50% relative humidity level within your instrument case. This system eliminates the need for manual adjustments and refills, protecting your guitar from warping, cracks, and other damage caused by improper humidity levels.
The system works by both adding and removing moisture as needed, ensuring a stable environment for your instrument regardless of seasonal changes, geographic locations, or temperature fluctuations.
Key Features:
- Two-Way Humidity Control: Automatically adds or removes moisture to maintain 45-50% RH.
- Maintenance-Free: No refilling or manual adjustments required.
- Protects Instruments: Guards against warping, cracks, and other humidity-related damage.
- Easy to Use: Simple placement within the instrument case.
2. What's in the Box
Your D'Addario Humidipak Maintain Kit includes the following components:
- 3 Humidipak pouches
- 2 Soft mesh pouches (for holding Humidipaks)

Image: Contents of the D'Addario Humidipak Maintain Kit, showing three individual Humidipak packets and two black mesh pouches.
3. Setup and Installation
Follow these steps to properly install your D'Addario Humidipak Maintain Kit:
- Insert Humidipaks into Pouches: Take two of the Humidipak packets and insert one into each side of the saddle-style mesh pouch.
- Install Saddle Pouch: Drape the saddle-style mesh pouch (containing two Humidipaks) over the middle strings of your guitar, allowing the pouches to hang suspended into the soundhole. Ensure the pouch does not touch the guitar's finish.
- Insert Headstock Pouch: Take the remaining single Humidipak packet and insert it into the smaller mesh pouch.
- Place Headstock Pouch: Place this single pouch under the headstock at the bottom of your guitar case.
- Close Case: Close your guitar case securely. The Humidipak system works best in a sealed environment.

Image: A hand demonstrates inserting a Humidipak into one of the mesh pouches.

Image: The saddle-style Humidipak pouch correctly positioned over the guitar strings, with the humidifying packets inside the soundhole.

Image: A single Humidipak pouch placed beneath the guitar's headstock within the instrument case.
Video Guide: How To Humidify Your Instrument
Video: This official D'Addario video provides a visual guide on how to properly humidify your instrument using the Humidipak system.
Video Guide: Planet Waves Humidipak Overview
Video: An official overview of the Planet Waves Humidipak, demonstrating its components and basic installation.
4. Operating Instructions
Once installed, the D'Addario Humidipak system operates automatically. It continuously monitors the humidity levels within your guitar case and releases or absorbs moisture as needed to maintain the optimal 45-50% relative humidity. No further action is required from the user for its daily operation.
For best results, always keep your instrument in its hard-shell case with the lid closed when not in use. This ensures the Humidipak system can effectively regulate the micro-environment around your guitar.
5. Maintenance
The D'Addario Humidipak system is designed to be maintenance-free in terms of refilling. However, the Humidipak packets have a limited lifespan and require replacement.
Replacing Humidipaks:
- Humidipaks typically last between 2 and 6 months, depending on the ambient humidity conditions and how well your case is sealed.
- Monitor the texture of the Humidipaks. Once they become firm and rigid, they have reached the end of their effectiveness.
- Discard the old, firm Humidipaks.
- Replace them with new packets from a D'Addario Humidipak Replacement Pack (PW-HPRP-03).
- Insert the new packets into the existing mesh pouches as described in the Setup and Installation section.
6. Troubleshooting
The D'Addario Humidipak system is designed for simplicity and automatic operation. Specific troubleshooting steps are generally not required beyond ensuring proper installation and timely replacement of the Humidipak packets.
Common Considerations:
- Paks becoming firm quickly: This indicates a very dry environment or a case that is not adequately sealed. Ensure your case is airtight.
- Paks not changing texture: If the environment is already within the optimal humidity range, the paks will remain soft as they are not actively adding or removing much moisture.
- Visible moisture/condensation: This is highly unlikely with a two-way system. If observed, remove the Humidipaks immediately and consult a professional luthier, as this may indicate an external issue or extreme environmental conditions.
7. Specifications
| Attribute | Detail |
|---|---|
| Brand | D'Addario |
| Model Name | PW-HPK-01 |
| Item Weight | 1.28 ounces |
| Material | Nylon (for pouches) |
| Operation Mode | Automatic |
| Humidity Control Level | 45-50% Relative Humidity (RH) |
| UPC | 019954952907 |
8. Warranty and Support
Warranty Information:
The D'Addario Humidipak Maintain Kit components are replaced if found to be defective.
Customer Support:
For further assistance, product inquiries, or warranty claims, please visit the official D'Addario website or contact their customer support directly. You can also refer to the D'Addario store on Amazon for additional product information and resources.
Visit the D'Addario Store: D'Addario Store