It's funny, I used those very same bags, right up til I started working on Quartz as my own project. (I took out all the other mod bits that I was using, so I could package the interface)
You're right, they would work well, and I recommend them for anyone that likes to organize their containers.
I may work on a small container option, as well, but I'd like to start from scratch. Kinda enjoying the crash-course in EQUI XML I'm giving myself.