I put them in a hard case. It's easy to install the code or change it if you like. The three-digit code is easy to remember, just remember the first three digits of SSAN. I haven't gone through TSA with them yet. I wish the cable lock was a little shorter (I can still partially open my suitcase) but it would be easy to just walk away with the whole suitcase and cut the cables. I just bought a set of strong locks in case they break.
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