I think I've positively identified the bag.
I've attached a couple photos for reference.
Now after spending the day searching I found what i believe to be the proper model, but i'm not sure about the color.
Cenzo Bags - 4 timeless styles, 4 great prices
I think the color may be vecchio brown like in this picture:
The main reason I think it should be vecchio brown is that the lining in the movie is different, but it's definitely a lining offered by the company that makes the cenzo bags.
Here's an example of the accurate lining:
Now, for those of you wanting something a little more affordable, search for "New High Quality Leather Brown Man's Business Soft Briefcase Messenger Bag" on a few popular auction sites and you'll find a cheap knock off that comes in black or brown.