I have always used the D'Addario two-way humidification system, but decided to try the Boveda. I was pretty disappointed when I discovered the packs are too large to be able to hang the double packet in the sound hole of my Yari WY1. The pouches don't hang freely. The are resting against the bottom of the guitar. The packaging shows another option for placement, that being to simply lay it on the fretboard itself, under the strings. I may end up doing just that, because the fit in the sound hole is terrible.