This bag is stunning!! I know this looks huge on the model, but I don't think 18" is too long. I have a RM MAB which is 15" and looks normal in size. I think the sides that go out make it 18". I love everything about the looks of this bag!
http://www.coach.com/online/handbag...0000000000318301&navCatId=5000000000000318301
http://www.coach.com/online/handbag...0000000000318301&navCatId=5000000000000318301