Hi there Mik James, I had thought about using one of those fiber drums a while back. When I was having a terrible time searching for and pricing out Sonotube, I kept noticing one of those barrels in a local recreation center being used as a donation barrel. I think that as long as the material is thick enough to support itself with the metal rings cut off the ends and replaced with wooden caps, it would work just fine. If you had any doubts, you could just add additional circular rings inside as braces. Good luck and let us know the results!
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