Lookie what I found from Aunt Rita:
At first I thought it was weird and cumbersome. I mean why wouldn't you just write all over the pattern and mark up the margins and every free space you could find to keep track of where you were?
Um, yeah, I gave it a try and it is awesome!!! And apparently they are available all over the place (Amazon, Joann), even though I don't remember ever seeing anything like it. I am thinking about making an updated-magnetic-wallet-type version. You know, in my free time!