You can use any pen or marker to fill in the states you've seen on your latest travels! The backside bumper sticker of your own RV.

note: it's best to use permanent if you place it somewhere that could get wet.

Iron-on
2 3/4" x 4"

Instructions:
Heat iron on high with steam on.
Peal off paper backing
Position as desired
Cover with damp cloth, press iron firmly for 10 seconds, repeat if necessary.