Boveda for Music | Double-Sleeve Fabric Holder for 49% RH 2-Way Humidity Control | For Use With 2 Size 70 to Protect Large Instruments From Cracking/Warping

Easy to install within my guitar case and a good value as the neck on the acoustic guitar is subject to warping. Nice to use with my electric guitar to prevent humidity changes.

Must have for expensive guitars, these hold humid pacs perfectly, the packs need to be replaced every 2 months but you only need them in the winter. Low humidity is the Bane of acoustic guitars.

Works

Works great