Joann fabrics. Or maybe Walmart. I just learned these things.
There is fusible fleece which is like thin batting with sticky stuff on one side so it doesnt require quilting just iron it on. There is interfacing which is usually the thickness of a piece of fabric and is sticky on one side, gives it body without the bulk of batting--you use this in Tee shirt quilts also. Fusible Web is like Wonder Under or Steam a Seam. Finally, there is Peltex or Timtex, it is really stiff and makes the bag have a shape.
You can order all of them online at Nancy's notions, Joann's.com, Hancock fabrics.
Btw, my girlfriend who makes alot of purses, always puts interfacing in her "pockets" even though the pattern doesn call for it. Just makes it finish nicer.
Last edited by seamstome; 02-10-2012 at 02:28 PM.