So far, I have used works I already had done - that is, I haven’t designed for a Bagstab bag, per se.
My designs are usually colored pencil illustrations that I then play around with on Photoshop.
I also use work that I have already done. I crop, manipulate with more than one software program, and play, play, play. It must be illegal to have this much fun! I did do two designs just for the bags. Had a fun idea that I couldn’t resist.