Huge bags that Keira and Mary-Kate are sporting lately?

I want a huge bag for Christmas that recently Keira Knightly and Mary-Kate Olsen have been sporting and that is usually described as bigger than they are. But so far I haven't managed to find a photo of it so that I could show it to my mom. Do you know some brands or the name of the type of this extraordinarily big bag? I'd really appreciate some links to photographs. I've tried to search for it via Keira and Mary-Kate photos but no success so far.