I had to laugh at this. I tried years ago to get my son (now 8) organized. I gave up after moving back to the States. All his LEGOS now reside in large (as in "it will take a mover to move it") plastic bins. This actually solves part of the problem because if the bins are too heavy to move they can be contained in his room. All pieces are mixed up, but I have all the LEGO building booklets in another smaller bin waiting for the day when he decides to rebuild the sets....still waiting:-)