Busi-Mess Essentials - Colombian Leather Messenger Bag Black. The Kenneth Cole Reaction Busi-Mess Essentials Columbian Leather Messenger Bag is one of our best-selling messenger bags. Made from soft, full-grain Columbian leather, this bag is not only distinctive and stylish, but it is also functional. It features lots of pockets for organization, including two under the flap, plus 2 pen holders. Dressy enough for work, but casual enough for everyday.