I've done it. The bag called for the bottom to be quite rigid so recommended using interfacing plus two layers of batting. I had to quilt a circle then sew it into the tube of the bag. It was sewn with the seams to the outside of the bag and then binding was added to the raw edges. I used cross hatching with the lines quite close together. It looked lovely and was fairly solid. BUT I had to sew the binding by hand because I couldn't get my sewing machine to sew through all the layers. If I made it again I would cut the circle larger, draw an inner circle 1/2" smaller than original size then only quilt to inner circle. It should then be easier to thin out outer circle and sew binding on by machine. Hope that helps sorry no picture as I gave the bag as a gift.