I highly recommend these steel shelving units from Whalen Furniture. 24" deep x 77" wide x 72" tall with wire decking. Use the interlocking feature & you can build three units out of two. Think I paid ~$160 each at Costco a few years ago. Most of my stuff is stored in bankers boxes, copy paper boxes and plastic tubs that I have tagged but that is about as far as I have gone with keeping an actual inventory.

I would like to find similar shelving in 12"x36"x36"/48"/72". Anyone know of any industrial shelving these sizes?