I use cable locks to secure multiple luggage and have had good luck with this concept so far. I have cable and U-locks and use them to lock various luggage compartments. Good locks.
Lumintrail TSA Approved Lock For Luggage Or Suitcase, Easy-To-Read 3 Digit Personalized Combination, Metal Travel Suitcase Luggage Lock, Red, With A 4-FT Braided Steel Cable (2 Pack)
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