If thier big enough to serve thier purpose. You couldn't read Delaware's from 5' away and it is oncamoflage paper. Md had that law and did away with it. Thier's was the same size.
Here's a picture of my De license back tag from 3 feet away. You tell me what good is it, it catches on the bark of the tree, comes unhooked and falls off, more trouble than it's worth. If states are going to enforce the wearing of a back tag for goodness sake, make it so itserves it purpose