I made this in like 20 minutes! This has got to be the easiest zipper bag I've ever made. And I didn't even download the pattern. I just used the largest circle from the Fiskars shape cutter thing to draw my circles, and a piece of ribbon as the tab. The top stitching was a little difficult on this one because of the layers and the thickness. But once or twice making this and I can see these in ALL the stockings this year.
I see that you said you were not going to patent this idea/invention/prosthetic. I think that it would be a good idea to patent it, only so that the information does remain free and no one else can take your ideas and then patent them away from you.