That is a type of Prada I believe, since they have that "rouched" leather this season, VB, Halle Berry are also in pics here on PF with similar type bags, check out Bergdorf, NM and Saks on line.
Prada Framed Gauffre - It's very big, almost luggage sized. I don't think it's sold online so the best way is to call a Prada shop if you're interested in buying it.
Go to the Prada forum. There is a ton of information concerning the bag there. Look for posts by Jill and Cougess and twins, I believe. The bag is fab.