Restricting the amount of residual bag waste that is collected encourages people to think about what they throw away and to recycle more of the things that should be recycled.
Mae cyfyngu ar faint o fagiau gwastraff gweddilliol sy'n cael eu casglu yn annog pobl i feddwl am yr hyn maen nhw'n ei daflu ac i ailgylchu mwy o'r pethau y dylid eu hailgylchu.