I made this handbag using this tutorial
https://www.craftster.org/forum/index.php?topic=52143.0
and handles were inspired by
https://www.craftster.org/forum/index.php?topic=226232.0

Handle option I,

Handles option II,

and inside.

I fused interfacing onto the exterior fabric and for the life of me I cannot keep it from wrinkling. Does anyone have any suggestions on how to keep this from happening either now or on future projects?