Google OPEN LUGGAGE PEN and watch that shocking YouTube video how someone can break in even with this lock on. Then consider the TSA can use their "five finger discount" keys to enter your luggage and swipe stuff. Add on luggage boys who are not always on video tape. So here's some good advice. Make beleive you cannot be allowed to lock your bags and some of your things ARE going to get stolen. Bet you'll pack lighter with only two sets of clothing, one pair of shoes, no jewelry, little cash, only one watch, and so on. You'll be proud of yourself when you see how light your bag becomes. You could make some thin cables with loops and string all your clothes together through shirt and pants sleeves, sandals, underwear, and lock them altogether so that inspectors can lift them out of the bag attached to each other. Add some aromatic unwashed undergarments for fun. All the rest of your valuables will be carried in your carry-on bag. You'll be surprised how I can carry an extra 50 poounds in a backpack and carry-on. Ask yourself would your trip be ruined if your bag was totally stolen? Would you care if the stuff you packed were never to be seen again? Now you will think about how a smart savy traveler packs. Finally, try this. Get a can of stale nuts and put a note in it, "F.U.N."