Every NANUK case has eyelets built into their design that allows for the addition of padlocks. You can use your own padlocks or you can opt to have TSA accredited padlocks added to your case before it is delivered to you.
A TSA padlock is ultra secure and ensures that others can't get in unless they have the combination, but is also convenient too. Airport security is able to unlock the padlock and then lock it again once they have finished checking the bag and this means that the contents remain safe even after being checked. It also means that security will not need to cut through the padlock. A visual indicator lets you know when the case has been opened with a TSA key.