Whoa, interesting reply from a professional guitarist, Thanks TGVZG!
Well, I'm not a pro, but the wife and I are getting back into cycling (now that it's mostly stopped raining). I'd rate myself 'advanced amateur' - I've been playing all my life, and play at church every Sunday.
At any rate, I bought one of the Voyage-Air entry-level models for $399 including back-pack case. VAOM-02. First was the case: it's a really well made backpack with zippered pockets for stuff, and has a chest strap (if that's the right term) so the straps can't slide off your shoulders. Along with the guitar, there's enough room in there for a picnic lunch and drinks and other stuff.
The sound, is amazing. A folding guitar is something that just shouldn't work - but this one does. When you fold it open, it's the same size as a regular guitar, and you would never know it from a regular guitar by looking at it. The hinge locks secure, it's not wobbly at all. It's easy to play, and I found no intonation problems. And it's light too - about 9 lbs for the guitar and the case.
The sound does not compare to my Martin guitar - noway. But at the same time, I'd never take my Martin out cycling, even for a pleasure cruise, even in a backpack gig bag. And the Martin is a way more than a $<500 guitar. I actually find myself playing it a lot.
A few days after I got it, the company put on a sale price for their appearance on the Shark Tank tv show. That figures. But I called the company and they credited me back $50 on my credit card to match the sale price. That's pretty cool.
In all, this is not a serious cycling accessory - just a cool way to take the guitar along like you said for a pleasure cruise. The beach is a long way from here, but Bidwell Park in Chico is not, and I get a lot of looks when I fold open a guitar from a backpack!
Many thanks to this forum. I've learned a lot. My Trek needs new wheels and tires for sure, now that I'm riding it (had been in storage 15+ yrs). If any of the above is not right for this forum, have the webmaster take it down. I'm just passing stuff along. Never thought there would be an easy way to take a guitar on a bicycle, that actually played and sounded decent. Now there is.