I use the clear plastic 'shoe boxes' you can get from Home Depot or Lowe's. They are see through, stackable and very inexpensive. I have a 2 boxes (minimum) for each caliber I reload. One is for dirty brass and the other is for tumbled brass ready to be put into the reloading cycle.
As part of the whole "reduce, reuse, recycle" craze, I use empty coffee containers, mayonnaise containers, and (my favorite) the big, clear pretzel containers.
And lots of people tend to give these away. I have a boat load of them and I don't drink coffee. It keeps them in manageable groups, generally light, and they're stackable. And they seal well enough that when I've knocked one over, the lid has stayed on.
Like I said earlier, 5 gal buckets with lids, the cat litter buckets work great.
If I have some primed bass, smaller quantities, they go in the big pretzel jars.
If I only have a small qty. of brass (.380) they go in the coffee cans with lids.
I also store smaller qty's of bullets in the coffee cans, bulk .223/.308 projectiles
My cast bullets all go in coffee cans.