I found a great tutorial at
http://nicolemdesign.blogspot.com/20...fast2fuse.html
She recommends Peltex or Fast2fuse and shows how to make a base that she sews to the lining before sewing the bag together. I especially like that because before I used different materials in the "pillowcase" manner, but always was losing things underneath them. This eliminates that problem, since it is hidden between the two layers. I have also had corners begin to wear through when I used harder materials.
Her method works great!