Here's a guide to what will happen to your guitar if it's subjected to too much or too little humidity, and what level of humidity is too little or too much:
Effects of Humidity on Acoustic Guitars
Funnily enough, the fate of a guitar left at the mercy of very high humidity is likely to be similar to
that of one subjected to very low humidity, albeit for different reasons- it will become unplayable, then the bridge will come off, then all the joints will begin to separate and the guitar will
fall apart.
The simplest and cheapest way to protect a guitar from excessively high or low humidity for shorter periods is to keep the guitar
intheflight case
Aguitar flight case
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