There comes a time to lay down your technology burden – and a properly designed bag helps
My previous most successful and secure way of carrying a light laptop in inner-city London - apart from a purpose-made bag - used to be slotting it between multiple copies of broadsheet newspapers, double-bagged courtesy of Tesco carrier bags.
In venues frequented by sneak thieves it attracted no nefarious interest whatsoever. Thank you Tesco. There have been many alternatives since then, but eventually I came across STM.