It looks like a new trend for Fall handbags that you can carry as totes and have straps that you can use as shoulder bags (It'll come handy when you need extra hands to carry those shopping bags.)
Marc Jacobs bag from Fall/Winter 2008 collection.
LV Graphite Porte-Document
3.1 Phillip Lim - Tally oversize carry-all
Balenciaga - Giant Pompom bag
Christian Louboutin - Large Double Pocket Pouchette