D'Addario brings its patented Humidipak Maintain system, powered by Boveda's two-way humidity control technology, to orchestral string instruments. This system maintains a consistent 45-50% relative humidity inside your case, protecting against cracks, warping, and open seams. Humidipak automatically adds or removes moisture as needed, with no water or refills, and no guesswork. To use, place the Humidipak packet in the pouch (sold separately), put it inside your case, and let the system handle the rest. NOTE: Humidipak replacement packets must always be used with the Humidipak containment pouch.

• Maintenance-free, two-way humidity control system for violin, viola, ukulele, mandolin, and other small instruments.
• Automatically maintains the optimal 45-50% relative humidity level within your instrument case by adding or depleting moisture as necessary.
• Packets last 3 months and should always be kept in a sealed case.