They are handy. I have one that is a fuzzy fabric on the bottom and a piece of clear table cloth weight fabric on top. I will post a picture ..... I just put a 8 inch block inside to show how it holds the block. It is sewn across the far end and the three other sides are open. There are ribbon ties on the end for fastening when you roll it up. I put painter's tape on the sides of mine because I use the plastic by itself to preveiw quilting designs on my blocks with a dry erase marker. [ATTACH=CONFIG]545101[/ATTACH]