Though I see the occasional Eminence at festivals, the Chadwick Folding Bass (in my experience) is a far better choice. It's flyable, but it's a real upright that looks, plays and sounds like a real upright. I don't work for the company, but I've known the Charlie Chadwick for decades.
I've taken my Chadwick all over the US (and am currently in Canada with it). If the Eminence is out of your budget, the Chadwick will be, too - but it's worth saving for. The website is www.foldingbass.com