Just started my two blocks. I usually save the last day of the month to make all my block of the month treasures. SinceI have several going (5) at one time it makes the day so varied it is like a vacation with all the different patterns and colors for each separate project. I keep them in large separately labeled manila folders until all the blocks are complete. I haven't lost a block yet with this method. The folders need to have at least 1/2" bottom for expansion as they get full. If it is a large project (full quilt and larger I use a hanging file folder with a 2" bottom) they hold several manila folders and work great.