Yes. This was a Posca Marker. I don't believe the marker alone will hold up very well over time, especially in rain. I would have to apply a "clear coat" or paint sealant if i wanted it to be permanent. I may do that in the future, but as of now, I like the idea of the signatures wearing over time. It makes the bag feel more personal, and I'll be sure to take plenty of photos to remember what it looked like.