Made of strong woven polyethylene. Held on to tool box with small, very strong rare earth magnets. When the top is closed, you roll the cover down over the front.
http://s916.photobucket.com/albums/ad5/KerryAll/?action=view¤t=toolbox4small.jpg
You can leave the cover on all the time, roll the front and top back and get to work!
http://i916.photobucket.com/albums/ad5/KerryAll/Toolbox1small.jpg?t=1337817110
http://i916.photobucket.com/albums/ad5/KerryAll/Toolbox2small.jpg?t=1337817110