Because of my namesake, I print and laminate then roll it up to place in a tube. Lamination helps them last longer, and while rolling them up puts a curl in the map, just roll tightly in the opposite direction and most of the curl settles down. Besides the weight of the lamination helps keep the curl down. Of course if the map gets beat up, I run a print shop, so I just print them again. I never fold them however. I can live with a curl far more than I can live with a crease. I print 90% of the maps I design.

GP