Things They Should Invent: garbage bins that are too small to be too heavy

I've recently heard of people whose green bins or blue bins weren't picked up by the garbage collectors because they were too heavy (the bins, not the people).

Simple solution: make the bins small enough that they won't be too heavy even if they're full, and give each household two or more bins. It seems to me that the weight of organics and recyclables should be relatively predictable. Assume each bin is completely full of the heaviest possible materials that might go in that size of bin, adjust bin size accordingly, issue each household a sufficient number of bins.