Travelling for an academic seminar with a 36*48 inch poster board on a flight I need to attend a competition\seminar with my teenage son. He needs to create a project for this competition on a 36"*48" trifold poster board. Now the dimensions of this trifold poster board do not make it eligible for taking it as a carry on luggage and its not safe to send it in Checked in luggage for risk of damaging the project that he has done. What are the options for carrying this poster board as a carry on luggage ?
One common option is to print or create the poster on a large sheet of paper and carry it in a poster tube.  After you arrive at your destination, buy a blank poster board, and paste your paper onto it.