Actually, it doesn't have to be a travel holder, I use it at home all the time. It folds up very compactly for travel, though.
By the way if you need a reliable, sewing machine that makes great buttonholes, I recommend this one - I love it!
I use cone thread for a lot of sewing. I was looking online at a neat holder like this one
suddenly it struck me - I have something similar .... You know those CD/DVD stackers? well, I thought - "hmm, that would make a good thread holder". Five minutes and a piece of wire later, I had a nifty free thread holder.