I just make my pockets out of the fabric doubled. I've never put anything in between but that's an idea.
Oh the batting I use, W & W, is 80/20 I think. I wash my purses and don't want that shrinkydink look to them. (I also use this in all my quilts; never used 100% cotton--I know that's a mortal sin to some here LOL).
Do you use anything in the straps or handles? I haven't cause they're like triple fabric and I haven't had any stretching or ripping but I'd like to know what you all do.