Boveda49% Two-Way Humidity Control Pack for a Wood Instrument in a Display Case or Utility Case – Size 320 – Single – Moisture Absorber – Humidifier Pack – Individually Wrapped Hydration Packet

Bought them to humidify a cabinet converted for ukulele storage. They work great, maintain promised humidity levels.

These things work beautifully. I use them is gun cabinets and cigar humidors. My wife uses one in a sugar canister. The different % humidity packs make them very useful for precise control.

Great product I use them all the time

Good product even though I bought the wrong one

... only works in very small areas such as a small box. Even in a guitar case it could not keep the humidity level anywhere near 49 percent, more like 32 percent.

Great product. Keeps those guitars from getting parched. Be aware that this particular unit is big and for guitar collection cases and not individual guitar cases.

I throw one of these in my 100 stick humidor every 3 months. Wish they were cheaper, but the ease of use is unmatched.

Does what it’s intended to do.