Alright, I went so far as to actually contact the good people who work on "24" but they were not forthcoming with information on Jack's fancy brown leather sack. But that can't stop us! By miracle of the internet (and actually help from Shane, an astute and very helpful reader of this site) I present to you THE SEASON 8 JACK SACK:
The bag is made by Ralph Lauren. It is called the Double RL (RRL) Leather Mail Bag. It retails for $895.
I haven't found a merchant link for it, it looks like it was released in 2009 and is probably not a part of the current collection. You can try your luck at RL outlets or through 3rd party sellers. Let me know if you find a place that sells it and I will share that information with everyone else in a front-page article.
So, if anyone from the show is reading this, no need to get back to me, we're okay. ;)