Here's how I store some of my material:
A couple of lengths of 4" soil pipe are cut in 3 ft, 2ft and 1 ft lengths and the whole lot is bound together with plastic solvent glue. The result is stood on a piece of plywood. The weight of stock prevents it from moving. Metals of different colour (e.g. steel and bronze) are stored in the same tube.
These Linnbins were picked up on eBay and were originally used to help me move the workshop from England to Ireland. I use them now for storing shorter lengths of metal and offcuts that I have managed to scrounge. The sections of gutter seen on the right of the picture are also used to temporarily store short lengths of material.