Purse Making Supplies Crafty Tip
When choosing interfacing for your bags choose one that is lighter in weight than you fabric, this way any creases made in the fabric (due to normal wear) will not show.
Bonus Handbag-Making Tips
If you haven't tried using metal accessories before; try them! Most of them require no tools (so they are quick and simple to apply) and they are an instant way to make your bags look really professional.
If your bags have a tendency to sag (when you don't want them to) try sewing polyester boning into the seams of your bags. Polyester boning is used extensively in corset making but it is amazingly handy for bags making! It's easy to sew and cut, and it is very inexpensive too!