I got some black foam core material and glue and gaffer's tape and made some nice black boxes to fit each negative size. It took about 20 minutes per box. I just put the sleeved negatives in the boxes. I left a little space on one dimension so that I can attach little post-it tabs with some cryptic identification code written on them to the ends of the sleeves. It helps to locate a particular negative occasionally. I only tab the 'keepers'. The 'yawners' go to the bottom of the pile.