We just secure them with security cable ties.
Any baggage handler wanting to steal from a case is going to have a knife or a pair of cutters anyway, all a lock does is stop a casual pickpocket.<p>The main problem in the US is that baggage claim is on the street side of the airport and security is limited to a mall cop who might check your ticket tags if he can be bothered.  A nice shiny camera case going around the conveyor 10ft from the open door is the main risk.