I've got a mix but my favorites are the metal pull out drawers and the plastic bolt bins. I've got about 30 linear feet of old 8 ft tall retail shelving with 12" deep shelves with adjustable height. The plastic bins fit perfectly. I just watch Craiglist or whatever and buy bins when they come up. Scrap yard I frequent gets them from the military base once in a while.
I'm expanding my loft/mezzanine next to move all the less frequently used items to up top. Too much junk in my valuable square footage.