Good thing 20 in each was what I was planning.. Might have to go with trash cans to get more without losing a lot of shape. The round can will distribute the weight evenly and won't really have a place to bow. You would just have to be creative in drilling holes if you were going to, to prevent tearout under the weight if you got super cheap ones.. Though I have cut holes in trash cans that filled with water and not had any tearout, so it might not be an issue.
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