MTM 100-round plastic boxes for loaded rounds for me. I use the "correct" caliber-marked box for everything except .38 Special flush-seated wadcutters -- I use 9mm boxes for those. I just discovered that MTM's making them in two pieces now, with an actual mechanical hinge (instead of a flexible bit of plastic between the two halves) which I'm happy about, since I use ammo nearly as fast as I reload it.
For brass storage, I use metal coffee cans and plastic jars and other re-purposed bulk-food storage containers.
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