The one thing I hear repeatedly when I hang out at the luthiers shop is admonishions regarding keeping the guitar humidified. 40-50% humidity is what you want. I've looked a bit for guitar cases with built in humidity control, but haven't found an affordable option. There are a ton of little jars and inserts that do it, but they typically get inserted into the body between strings, which is a pain and you risk scratching or dinging the guitar each time you put it in.

A stand-up gun safe would be an alternative. You can get them with humidity controls.

Hard to pack to the gig, though.

You get a loaner backstage.

Saves having to buy another plane ticket too.

Not a bad idea of they are big enough for a row of guitars. I don't gig, and they just need to be maintained when you don't have it out by your chair.