This is a small, narrow bag. It forces me to simplify what I carry, which is a Orla Kiely big zip wallet, iPhone, keys, lipstick and a pen. That's about all you'll be able to carry. There is a narrow outside pocket, but it's very slender, so nothing much more than a letter will fit. You wouldn't be able to add a book unless it's a very narrow paperback. This bag forces me to simplify and also looks really nice and professional.