They don't show the coolest feature of this bag: The back pocket has a zipper at the bottom.  Unzip it and it slides easily over the handle of your rolling luggage.  I bought this on holiday and had it as my purse for the plane, and it was fabulous.  I'll also use it as my tote this summer to and from the office.  Great construction with lots of hidden plusses for features, such as the lipstick/chapstick loops inside the bag.  Now I won't have to spend a lot of time digging around for my chapstick!  Or my wallet - it's on a loop.  Or my keys - also on a loop.
And I love that the top completely zips closed to protect your stuff from the weather and theives.  I bought it from a store and paid way more than the price here.  Still, it was worth it (although if I buy another it will be from here - the price is very competitive).  I highly recommend it!