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Garrett, I really like the look of your storage box! Do you have plans, dimensions, etc.? Thanks!
Bring a Buzzz or Stingray to Homie D's and buy some concrete forming tubes of the appropriate diameter. They're in Building Materials section for about $5.
Sterlite 20 Qt. - 1844
At Walmart, Kmart or any body that sells Sterlite
Try this link. I don't have any of these boxes, but they seem like they will work perfectly.
I believe you wanted VERTICAL storage. These should work just fine.