Do you use a nappy bag as a handbag, or do you need to carry a nappy bag AND a handbag?
I don't know the answer and this will influence my decision about what size to buy etc. There are two that I really like and I don't mind spending the money if it will be my 'handbag' for the next 5 years of so (planning on two kids).
Here is what I normally carry in my handbag: wallet, phone, keys, makeup bag, umbrella, diary. Will all that fit into a nappy bag too, or are they only designed to carry nappies, bottles, etc?