Another method that is very similar is 
        to 'tack' the poster with the same little rolled pieces of acid free tape 
        but instead of 'bagging' it, you can have it 'shrink-wrapped'. 
      OK , confession time again
. I've 
        done this a lot. When we had our retail store, we had a lot of college 
        kids that wanted a nice poster to put up in the dorm. They WERE NOT going 
        to pay the expense for framing but some were getting interested in collecting. 
        
      We've done literally 'thousands' of mini-sheets 
        this way. Having several colleges in town, we would get this problem every 
        September and January. We knew that they were going to nail or 'push-pin' 
        them on their walls so we would 'shrink-wrap' them on a slightly larger 
        board so it left a border all the way around the poster. Then we would 
        show them how to 'nail' the poster up by nailing thru the board border 
        and NOT the poster. By the way, it doesn't pop and tear the shrink wrap 
        if done right.