They are very strong and can be used as regular shelves or as stock racks.
You can even use them for workbenches if you put them at the right height.
The uprights are "unistrut" u-channel that hang from the container's upper tiedown rings.
The shelf support brackets are as simple as possible, just a flat plate or board with two holes in one end.
They bolt onto "springnuts" a.k.a. "diamond nuts" inserted in the unistrut.
Here's how to get the wood for your shelves very cheap.
In this photo Michael Kearney puts freshly linseeded boards up.
WARNING:
The brackets must be bolted firmly. When the wood dries and shrinks the bolts must be tightened again. Otherwise these shelves are a deadly time-bomb booby trap.
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After about a year they tended to sag a little bit. The bolts gripping the brackets slipped a bit because the wood shrank. I didn't think much of it.
Then the end-grain wood failed and the brackets collapsed, dumping everything into the middle of the container. Damn. I'm glad I wasn't standing under that stuff.
So then I went around tightening the bolts on the remaining brackets. It would be good to add some kind of a cheek plate to the brackets so they couldn't fail in this way.
Check out this collection of other dumb mistakes I've made.
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You can stack 20 on 20 ... and 40 on 40 only !!!
We used one in a testing project back in the 80s and found it possible to punch holes in the aluminum skin if you were careless. It is much more sturdy than normal housing siding - just not impervious to puncture.
Wikipedia on shipping container architecture