Here’s a poster we printed for the Loon Preservation Committee about a study of loon populations on Squam Lake (otherwise known as Golden Pond).
In this case, the poster needs to stand on a table along with other things, and it works best to have it elevated just a bit with an easel holder. So, they bought a poster mounted on foamcore and put the edge trim around to protect the edges.
They could have used a trifold poster, but then it would have been right down on the table. This setup works really well for the way they do their display.