My husband often flies for work purposes and takes a zip-up medium sized suitcase which has to go in the carrier if he is going for more than a couple of days.  He ordered a package of three of these locks, mainly because one of the zips kept opening slightly, so the lock was a way of holding it together, but also in today's climate I think it a good idea not only for the safety of belongings inside to lock a suitcase but also as a protection to stop anything from being added to your suitcase. ~The Padlocks~ They came in a pack of three identical locks.  These are Henry Squire Recodable Padlocks specifically designed for luggage use - for suitcases, ...  Read the complete review