For me, I found that plastic shoe boxes are readily available, stackable and cheap. For handgun cartridges, they hold more than 1000 pieces. I keep them in 2 different areas. Those that have been shot by me as new or purchased as once fired, go in one area, and after reloading, go into a twice fired area. Once I go through all the once fired brass, those containers are then marked 3x fired, and the process starts over. In this way, I keep track of how many times cases have been reloaded, and keep my brass segregated. Even though see through, I mark the ends of the boxes with the sizes of the cartridges contained.