I bought these handy plastic/rubber containers from a popular big-box store. They're called ViewTainers. They're very handy for storing and dispensing rivets, because you can carry them anywhere with almost no risk of spilling rivets all over the floor, or into the deep recesses of your airplane. It's easy to squeeze the top open to tap out a few at a time. They come in multiple colors. I use the blue ones for AN426 flush rivets, and the red ones for AN470 universal rivets.