I'm not really sure how having a zip tie would help regardless - is it the idea that you are going to secure the bag? So lets say you get to your destination and the tie is gone, what then? Even without the zip tie, its going to be pretty evident somone tampered with you luggage anyway once you open it - how will the zip tie change that? You'll know to brace yourself before you open it? If they are going to get in, thats not going to stop them.