I bulk roll a lot. So I write in small font what I am loading onto a thin piece of masking tape with a sharpie permanent marker.
The tape gets a small fold under one end to make it easier to pull it off.
The tape initally gets adhered to the top of the film storage can.
When the film is loaded to the camera I peel the tape off the can lid and either stick it on the back of the camera, or the side of the pentaprism.