I have been thinking about this bag for ages. I actually purchased a Medium Black Signature and a Large Khaki and Red on separate occasions and returned them both. I am 5'5 and 135 lbs and I love the large (I think the medium looks too small) but I do have some back problems so I would have to be careful to not stuff her or I wouldn't be able to carry her all the time. I love the Khaki and Red but think Black Signature would be better for my wardrobe. Should I just go for it??? Maybe just get the Large Signature Black???