I guess it all depends on the individual. Different needs for different knitters, and different projects.Like yarnrainbow I have one of those bags on a wooden frame.(Had two, but in a weak moment I let my daughter have one of them). Easy to carry around and then just open the legs up and set it on the floor. Also makes it easy to see what you've got inside. A few years ago I found the mini version of this same type of bag at a Dollar Store. It's nothing fancy smacy, but then it only cost me a dollar!
Now I wish I had gotten more. I use mine a lot to stick my skein of yarn in when I working on a project. Open it up and set it on the floor next to me. Keeps my yarn from rolling around to who knows where.
Jeanie in TX