Actually have not recieved the bag yet but know what to expect.  Have another for a smaller laptop - I just hope the reviews are true that it will fit a 17" laptop.  This particular bag has a large piece in the back that goes over the luggage handle and is very secure. Love being able to slide over my carry on and not hang it on my shoulder. Originally ordered the Xenon a while back but found the"strap" a potential problem. May or may not have been but returned it as I wasn't willing to take that chance.