There's nothing worse than needing your identification at security and having to sort through all of your carefully folded clothing. Avoid this and put all of your identification and electronic devices in an easily accessible location in your bag.
This way, when you get to customs you won't have to tear your bag apart to place your laptop in the X-ray machine. A lot of airlines allow a carry-on and a handbag, so keeping these belongings in your smaller bag can make your experience more convenient.