One piece of cardboard, collapsible shelving...looks simple enough
Modern wood stacker
steel racks for steel | Copyright 2010 Stoess Manufacturing, Inc.. All rights reserved.
The Stack Rack
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wall mounted cardboard cabinet - Google Search
Materials rack for the garage or shop
scrap steel storage - Google Search
Vise Grip Storage
Neat idea for metal storage when you have vertical space but limited horizontal space.
West Horizontal Storage Rack - 5ft. x 3ft. x 5 1/2ft. Size