I make a lot a zipper pouches. The first thing I do is interface all the pieces with Pellon SF 101. It gives body to the quilting cotton. Then I use fusible fleece on the main body pieces, over the SF 101. Do not use the fusible fleece on the lining pieces. It is too much. I then box the bottom corners. They come out with just the right amount of stability, yet can be easily folded for storage.