I recently had TSA cut the lock of my suitcase, therefor leaving it unlocked for my travel back to Eastern Europe. I had bought 2, 80-GB iPods the day before and put them, still in original packaging, in that bag because of the lock. Needless to say, when my luggage arrived 7 hours after I did, both iPods were gone. I have filed a claim with TSA, so they should reimburse me for the theft. At least they give me that impression. So, my recommendation is to get TSA approved locks (SafeSkies has the ones I bought). They are combination locks that also have a key slot so TSA can unlock them and then relock them. Type "TSA approved locks" in Google.