I recently saw this cool bag that a friend had. It was made all in black zipper and, well, you have to see it to appreciate it. I had to make one. Here is the finished bag:
My pouch finished at 6" wide by 4.5" tall. I used 2 colors of zipper by the yard and used 2 yards of each color (#5 nylon coil) to make this size. I separated the pink and the purple and zipped them back together to form the stripe effect. With 2 colors and 2 yards each, you would get 2 pouches of course. If you use a single color, 2 yards will make one pouch.
So where do you find zipper by the yard? There are probably a lot of online sources, but I use http://www.zipperlady.com/ for my zippers. She sells retail and wholesale.