> I can fill them up quite heavy and they not complain.
Just be mindful. According to a friend that works for the waste collection for the city the arms do have a scale built in. Occasionally homeowners try to dispose of something heavy, like construction material, and the driver will leave it right at the curb.
Also, I think it can be done. NYC simply chooses not to. Paris, for example, has uniform size and color bins.
