Ivation TSA Approved combination lock is a very sturdy lock with a unique red-tab indicator that lets you immediately know if your lock was opened by anyone. The color of these locks is also quite unique and help in easily recognizing your bag in the baggage claim carousel.
Depending on the country and the Airport you are flying to it is always recommended that you lock your bag, it is also important to use only the best TSA approved baggage lock. Because in some cases, TSA officers will have to open your baggage as part of the screening process. If your bag is unlocked, then the officer will simply open and screen the baggage if any item in your baggage is marked by the automated scanner for secondary screening. However, if you decide to lock your checked baggage and TSA cannot open it through other means, then the locks may have to be cut. As you can notice in the above picture, the TSA can open the lock using their special key.
Note that sometimes locks can go missing as they can get caught with automated baggage belt, so smaller the lock the better. So Ivation does well here as well.