my dog be 10 , so I have have the opportunity to try lot of different bag . there be the best . they look good -lrb- in that you can not see anything when fill ! -rrb- , they be easy to open , and I love the extra lining at the bottom . I also really appreciate that they be biodegradable . one large box last I about 5 month . I have never have a problem with they be weak or degrading before they time .