I keep mine in pocket inside my coat.
I have lost it once this year pheasant hunting , but a couple of cool guys found it and returned it to me at Black River.
I have lost them in the past as well when they were on my back.
I have come across GW/CO's and presented it from my pocket and it really wasnt an issue, politely explained when/if asked (only once or twice).
Nowdays, with all the stamps and permits and stubs plus the personal info on it, the security of these documents outwieghs the need to display it.
And as someone said above....
My duck hunting coat doesnt have loop thingie for it, and I am NOT punching a hole in a $250 waterproof jacket. My upland coat has one...and it fell out anyways, so now it gets pushed through a few times and rubberbands as well to secure it.
Most of the time, when you are just getting "spot checked" stamps/permits are the big thing, as long as you are legal and have ALL your stuff, and not doing anything shady, I dont think evena gun-ho rookie yahoo GW/CO is gonna write ya for that.
JMO