I have a few Yazzii bags, which are half off right now at
www.Joann.com. I have the large organizer with pages and the supreme organizer. The large organizer is fairly small and is great for carrying handwork; the supreme organizer is great for bringing all your supplies to a class or retreat.
I also just purchased a pattern for an organizer but I haven't had time to make it yet. It's this one:
http://www.byannie.com/shop/product/hold-everything/ but she's got a number of patterns that are great for this sort of thing.