Purses, Packs, and Pants
The key to all security scenarios seems to be having all your important stuff attached to you at all times. Here's How...
When flying overseas, we wear Royal Robbins cargo pants with lots of securely zippered and Velcro pockets. Passport, boarding passes, credit cards are safe.
In the city, we wear a waist pack or an over the body shoulder bag that can't be pulled off or cut off us. They are also protected from having the bottom sliced with a razor blade in order to grab contents as they fall out.