Laminate it (or use clear tape on both sides) to make sure it's rain proof. After that I tape it to the stock.....but I'm using synthetic stocks and don't care if they get tape residue on them.
I have considered making a wrist sleeve or sling wrap out of a QB's play card holder but taping to the stock is the easy way for me. Something like this might work:
https://www.amazon.com/WristCoaches...&hvtargid=pla-524949881240&psc=1
