I blogged about my favorite awhile back:
http://grendelskin.blogspot.com/2009...-handwork.html
This little case was designed for beading, but I've used it to transport my GFG hexies, clamshells, small crochet projects, and pies for the Pies & tarts quilt, and so far it's been great for every one. It doesn't fold flat but it does make a neat bundle that goes easily into carryon. I'm not affiliated with the manufacturer/dealer in any way, just love the product; I have 3 of the bag inserts and use it all the time, just swapping out the insert depnding on which project I take with me.