I use any thing I have. If it is unused brass I just keep it in the boxes they come in. If it is used, I have used zip lock bags, plastic containers, just about any thing I have on hand at the time. I have purchased a few of those inexpensive zip lock plastic bowls with lids to use too. The size I did purchase is just right for 500 223 cases. I have never used a five gallon container, because I do not have that much brass of 1 kind - but if I did, I would use it. As you can see from these responses, just about any thing will work. On the boxes I write on the side facing out with a felt tip what is on the inside so i do not have to dig through them all to find what I want. As for the rest of the containers, I can see through them to see what is on the inside. Good Luck and Good Shooting