What a great thread! Surprized it hasn't showed up earlier. Kudos
@DPittman for posting!
Everyone is different. But for a fabricator, this is what works for me: multiple different sized storage solutions.
Storage1 is an adjustable rack on casters that stores up to 8' lengths vertically and is where most of my stock is stored. The horizontal slats I copied from Metal SuperMarket's old location. They can be moved and adjusted. Originally (20 yrs ago) this rack stored horizontally, but then I learned and converted it to hold stock vertically.
Storage2 is a plastic tote bin and holds medium sized off-cuts. I learned the hard way that the weight here can add up. The latest version now holds 1000 lbs., on 4 swivel casters.
Storage3 is my favourite! It is a half-gable storage shed I custom built to match my house. It stores my best friends (Honda single and 2 stage snowblowers plus lawnmower) that drive up onto fold down ramps from doors on either end. Metal flats up to 14' are stored in the rafters. They hang from suspended chains. I built it to hold hundreds of lbs. of stock, as the studs are 16" OC, not 24" as in most sheds. This way I can take advantage of good deals on stock and buy long lengths, and store until I need it. As some of you know, I am not on the machinist side of the forum; I am more of a fabricator. So I hydraulically bend and ring roll a lot of longer stock. This shed also allows me to store sheet stock sideways, although a few years ago I had minor rust issues on some sheet. So this summer will be adding weather stripping to mitigate this.
Storage4 is two small 16 gauge boxes attached to the back of Storage1. I just toss small (< 6") scrap flat bar, tubing, angle, etc., into these in case I need a piece. I have a sentimental attachment to these two boxes as I first learned to TIG on the corners of them. Even though it was 10 years ago I recall figuring out that with 16 gauge, it was too thin for the smallest rod I had, but too thick just to melt together w/o filler rod. I saw some scrap 0.35 MIG wire and tried it. Perfection! To this day I love those corner joints.
Having said all this I love the
@Dabbler idea of wire mesh. If I had the room, this would be my go-to solution for long stock.
P.S. Sorry
@DPittman as I just noticed you were more interested in short stock. In my eagerness to respond I went down a path for longer/non-machinist stock storage.