It might be interesting if you could find or make a lid for the side boxes where the handles of the buckets would rotate up and work as lid holders somehow. Not sure if that makes any sense, and a google image search is failing me, but I can see it in my mind what I'm trying to suggest. It would keep the handles from rattling and bouncing, and there should be enough "spring" in the handles to snap into a recess in the lids to keep everything fairly intact.