Neat idea.Thank you for all the suggestions! Very helpful. I went to Home Depot to price some metal garbage cans, and to see if they had any small ones, but I actually stumbled on this: its called a "Gamma Lid" and it snaps on to one of those large 5 gallon buckets (i think its 5 gal?) and then it has a top that can screw on/ off. I looks like it seals pretty good, but I'll see when I try it out. If it works, I'll be satisfied, as we have a couple of those large buckets that are empty.
Here's a picture I found off google, in case anyone is interested - aparently they come in different colors, but HD only had it in black.
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