I bought a padlock and chain today. Not about to have the baggage stolen from the pack animal (Air NZ).
Shocked at the technology needed in the saddle-bags. Cell-phone, tablet, camera, MP3, plus chargers for everything - all different makes of course. Plus a Tomtom (Richard Coeur de Lion didn't have maps either). Adaptors for car and French (circular!) plug-points. So much for the eremitic pilgrim.