I am looking at these three bags. I really like the Denim Slim Flap (similar to the Carly's) and I love the black Ali and Hippie. I know the Hippie has the longer strap and is a bit smaller but waht about the Slim Flap? Is it just like the Ali in size and length of the strap? I carry, a wallet, an agenda, my glasses and a book at all times. Do you think all of this would fit in a Hippie? A book like a Romance Novel. Oh and my keys!