It's hard to determine whether it's authentic based on just the two pictures shown but if authentic, it's style 12317, patchwork signature satchel.Item Name (if you know it):
Link (if available):
Then attach any photos (all authentication must include photos.)
http://images.craigslist.org/3n23k03o45Of5P75Rea2fd8e4fa0e967b15b5.jpg
http://images.craigslist.org/3m53pa3ld5Od5Pc5S1a2f009a27fc51821ad4.jpg
The problem with Craigslist listings is that sellers often "borrow" pictures from other sources so what you see may not be what you'll get.
If you can request additional pictures, ask for a picture of the creed, the interior lining, the bottom and the side.