I would recommend the Kwigy Bo bags. I just ordered my third KB Alex bag the other day
I have the large so that I can carry both of my pups. I would say they are great and decent priced. I've looked for an all leather bag, but they just don't make them in a large enough size for me. I can post some pictures for you.
Here is the first bag I purchased. It is the putty color, but is no longer available. Couver was about 5 pounds in this picture. The bag was very spacious.