I went to the dollar tree when i was using tubs i bought ornament hangers the ones u use for hanging christmas tree bulbs. i then drilled hole between the top of the lid and in the edge of the tub where they connect and put them through and twisted it shut. that seemed to be pretty sturdy worth a try
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This reminded me that I've seen someone use leash clips in the past, through holes in the edge of the tub where the lid connects, in the same way you do. I think this is a good idea.