I found a Giant Label that we used a while back (I forget what for) so I decided to make a Giant Hangtag. 
I stitched 2 regular sized seatbelts side by side and used one of the large grommets that we use on the Berkley Totes. 
To give you a perspective our Regular sized hangtag is in the middle and the mini hangtag is on the left.
Maybe next I'll make a Giant Seatbeltbag to go with it. Hmmm....