I am a big fan of those giant freezer zip lock baggies that don't appeal to you! LOL* Most of my current projects are stored that way!
I also like to re-use the bags that your linens often come in...you know how sometimes they have zippers? I have a few from a pillow sham set I purchased a while back that fit up to a 10" block in them and lie flat. Saves on ironing. ;)