The TSA will be checking your bag whether you see them or not. If you don’t see them it is even more important that you have a lock that is approved by the TSA. The TSA needs access to your bag! PERIOD!
The TSA in assocation with lock manufacturers have come up with a standard locking system. Read more about it at www.travelsentry.org.
I have some of those locks available to you. View the locks I have listed below: