I too use zip lock bags. I use the sandwich or quart size for each color as I cut it for the blocks; then as the blocks are assembled, I use the gallon storage bags, labels with washable markers, to ID the block and the project. I have one plastic tote/bucket, that I use for WIP, including thread, bobbins, scissors, needles and pattern. It is very easy to pick the tote up and move around from room to room with the tote. I have to admit, I usually only have 2-3 WIP at a time. I'd love to have more, since I occassionally get bored with the current project. But finances and working full time prohibit have too much going at the same time.