E.D.
I am a custom designer in Benicia, I deal with people all the time who have ideas and want to make them a reality. First find a designer who can make a prototype and a pattern for the bag. Have them sign a disclosure that prevents them from stealing the idea and it protects you as the inventor. Then take the idea, prototype and pattern to a manufacturer and have it produced. If you want to keep it small in boutiques, you can have a seamstress produce some and you can take them to boutiques and see if they will sell them for you. Benicia has many of those kind of shops that will sell items like that. Any town usually does. You can also get a booth at local fairs, or farmers markets and sell them in various fabrics.
If you are interested in having me do it, call me and set up an appointment at my studio. Hercules is not far from Benicia. Usually any custom designer should be able to do this.
Good luck and hope you get it going.
E.- email me at( ____@____.com )for more info.