Nerfherder
Honorary Master
Always lock!
Once the lock got broken and the zip was opened and I found everything messed up in the bag.
On my previous two trips leaving SA to overseas had my bag cut each time with a pen knife.
It depends on what type of bag you have. Can it easily be cut open e.g. thin Material?
The backpack type bags are very susceptible to this as they have small compartments.
You should never lock your bag for this exact reason... a locked bag is a target. If you are going overseas then you should have it wrapped, not so that people can't take things out, but also so that they can't put things in.
Also, don't put valuables in your luggage !!!