This bag has room for your netbook and external hardrive with their respective cables. Situated inside the bag lid is a pocket where I have put the manual for the netbook and a couple of spare rewritable CDs/DVDs with sleeves,and in the outer lid compartment I have put my "slim burner" and a couple of cables,after that there is little or no room left over, however thoughtfully packed you should be able to "get by" away from the office or home.
The bag itself is very well made with a well finished interior and a tough fabric exterior which I think will last many years under regular use,and importantly keeping it all together are two sets of sturdy [double] zips, each zip has two "handles" which can be drawn together and parked in a position of your choice. A small luggage lock [not supplied]could be put through the zip handles to avoid a sneak theft from your bag when it is out of sight such as on an aircraft,coach,train etc,the same as you'd lock your flight bag. Excellent value for money!
Kevin O'Neill [Cardiff].