During our 25 Days of Christmas of 2021, we asked about your favorite bag interfacing/stabilizers. We all use a small selection of interfacings and based on your responses, SF101 is the favorite and most used. Decovil Light, Pellon Fusible Fleece, Wovenfuse, and Soft & Stable were other popular responses.
Personally, I use Decovil Light and SF101 in most of my bags. Fusible fleece for slouchy bags, decovil heavy for bases, and occasionally Soft & Stable for By Annie Bags.
This is the list of your responses!