I only use cash for travel so carry quite a bit. I must confess to keeping it in my bag in an overhead compartment on planes, largely because I have always figured that I could trust people who could afford an airline ticket and had never heard of anyone being robbed on a plane. However, as with dog meat, bear bile, pangolin scale medicines and Cambodian call centres with imprisoned workers, the Chinese have brought to my attention yet another area of life to which I previously never gave much thought. I will be vigilant on future trips.