It is an average size, soft-sided bag.  It has a zipper pocket inside to put a men's wallet, pen, cell phone, etc.  It is not huge, but enough to put a handful of small items like that.  The main compartment is big enough to hold a book, a small(ish) laptop or tablet.  It is not as protected as a laptop bag will be, so if you drop it, or if it gets kicked or something, anything that is fragile could get damaged.  With that proviso, however, it is a good bag to take if you use public transportation and do not want to carry around a traditional briefcase or larger bag.