My "block buddy" starts with a sturdy paper roll (think Christmas wrapping paper) cut to your desired length. Make a round top and bottom cover and then make the length of your book you want it to be. Attach your roller by gluing or sewing to the fabric as it meets your cover. You can lay your blocks in the roller, roll it up, and tie with a ribbon until you need to open your roller up. I have given many of these as gifts. They last a long time and the colors are lovely when you finish.