If you make a duffel bag, or a bolster pillow, or a round bottom drawstring bag, you’ll need to sew a tube of fabric around a flat circle. It’s not difficult, but it can be frustrating if you don’t know how to ease the straight edge of the tube around a tight curve. Sew4Home shows two methods for doing this. One method uses gathering stitches, and one does not (and also has an optional lip). See how to do it at Sew4Home.
[photo from Sew4Home]