I have a 5 gallon plastic bucket and 2 Rubbermaid containers full of 9mm cases now. I have 2 Rubbermaid containers of .45ACP brass, and only a little less of .40, .357 and .380... The .38 Spl., .44 Mag and .45 Colt brass, I just keep in a big sack. I have enough brass to last me if I lived 500 lifetimes. Why I still pick up any of it, I don't know.
But, I've mellowed a lot in my old age. I've learned not to sweat it if I leave 8 or 10 of them on the ground. It's cut down on my psychotherapy bills quite a bit.