D'Addario Guitar Humidifier System - Humidipak Maintain Kit - Automatic Humidity Control System - Maintenance-Free, Two-Way Humidity Control System For Guitars

I bought a pack of these just under a year ago, and one of the humidipaks is only starting to solidify now - so I find that super impressive! This is well over the three months' time frame stated in the write-up, so I'm surprised by some of the comments that these packs haven't lasted. I suppose it depends on where you live, the humidity/dryness levels, the type of guitar and case, and so on. I have a Taylor acoustic guitar and Taylor hard case. The system is simple and avoids the hazard of having to put water inside the case - which I really think is asking for trouble. Just put one under the stockhead and the other over the strings, close the case and it works its magic. I initially bought mine because my wife and I use a wood-burning fireplace in our home during winter months and it dries the air out like crazy. I don't know what your results will be but I highly recommend this product based on my experience. I've just ordered refills, hence my write up now. I also think this is especially useful for any beginners/improvers who won't know how to maintain their guitar using other methods.

Excellent

I really like this system and it's simple to use, no having to do water, sponges and avoid the hazards of water and wood meeting. This is nice, just put it in the case and put the other over the D and G strings, close the case and it'll work it's magic. However after a few weeks less than a month the single pack in the case started to solidify and tried to mix it up to get it too work. They last around 2 months, not the 3 months advertised, and they're costly to replace so it's a bit hard to like it in one way, so of the costs replacement sachets it loses a star. I would recommend it fully though!

Worked great on my J45 when moving around the Middle East with work. Much better and less messy than the water based products that you have to manually refill.

Not very good at all, put them in my guitar case, makes not much of a change compared to the humidity outside the case, doesn’t work well enough to keep it in the safe 40-50 range for my solid wood Alvarez, had to buy a dehumidifier for my room instead

A must-have especially for storing and protecting acoustic guitars. I have been using D'addario humidipaks for decades. Don't buy any alternative - these are the best!!

With the weather in the UK being what it is. It’s hard to get a consistent humidity in my flat. It hovers around 45-60%. So this kit is perfect for my acoustic guitar which I leave in my Hiscox hard case. It allows my guitar case to be humidity regulated much better than my flat and gives me peace of mind that my guitar is nice and safe.

The sound hole pouch was poorly manufactured. It is a double pouch, made to hold two of the Humidipak packets. The double pouch is suspended inside the sound hole of the guitar by being placed neatly over the 3rd and 4th strings of the guitar, so that they can keep the guitar at the correct humidity. However, the double pouch I received had one pouch significantly smaller than the other and the Humidipak packet would not fit into it and was left sticking out. The double pouch would not therefore fold over properly, so is cock-eyed and sticks out at an angle from the guitar strings rather than resting neatly on them as it is supposed to do. Another example of shoddy workmanship from China? No! Apparently all made in USA. Very disappointing! I suppose I will have to put up with it, having already opened the bag with the Humidipaks in. And it wasn't exactly cheap either!