After printing out the pattern I mark on the pieces whether the piece is white fabric (W) or coloured fabric (C) then I cut apart all the pieces. I chose the colour of fabric I am going to use for the block. All my white fabric is muslin. I then put the pieces and the fabric in a small sandwich baggie. Ready for the next step.
I make sure I have put the name of the blocks in the bag with the fabric and pieces. At this point it would be almost impossible to tell which blocks were in the bags without them being labeled. What a production that would be!