Things You'll Need
Instructions
Remove the rubber band, and unroll the poster.
Place the poster on a large hard surface. The poster's corners should be curling toward the surface.
Place a large heavy book on each corner and in the middle of the poster. Text books and dictionaries work well to flatten posters. Leave the books on the poster for 24 hours.
Remove the books from the poster, and check to see if the corners have flattened. If the corners are still curled, place the books back on the poster, and leave them there for a few more hours.
Hang the now flattened poster on a wall with thumb tacks or sticky tabs.