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I make/made mine out of the lids from plastic milk jugs. They aren't as compact as the ones you made, but they don't require any cutting (just drilling).
Nice ideas.If you want to save some money, consider using those inexpensive shower curtain hooks instead of carabiners. Yes, the carabiners function better for some things, but in many cases, those $0.15 shower curtain hooks work just fine.