2Pack Portable Sound Hole Humidifiers for Acoustic Instruments Keep acoustic guitars and other hollowbody string instruments stable and protected from rapid humidity change. These compact sound hole humidifiers help reduce the risk of wood cracking and finish damage while preserving tone and playability. Key benefits Prevents cracking and warping by buffering internal humidity fluctuations that stress wood. Extends instrument life and helps maintain consistent tone and tuning stability. Compact and portable design fits inside the sound hole without interfering with play. Durable construction for repeated use and easy handling. Two humidifiers included for use on multiple instruments or as a spare. What it does Sits in the sound hole to provide gentle, passive moisture buffering inside the instrument body. Reduces the impact of dry air from heating, air conditioning, or transit conditions. Simple to insert and remove for quick installation before storage or travel. Compatibility and form factor Designed for acoustic guitars and similar hollowbody instruments with standard sound holes. Lowprofile, portable size suitable for storage in a case or gig bag when not in use. Built for regular use and transport thanks to a durable build. Practical use scenarios Home storage during winter heating: Place a humidifier in the sound hole before storing the guitar to reduce drying and cracking risk. Travel and gigging: Carry the compact humidifier in a case to help protect instruments while moving between venues and hotels. Studio and rehearsal spaces: Use during long sessions in airconditioned or heated rooms to maintain stable instrument condition. Package contents Two portable sound hole humidifiers. Simple to use, unobtrusive in play, and useful for any guitarist or musician who wants straightforward protection against humidityrelated damage.