A TSA lock (often colloquially called a "TSA customs lock") is a specialized security device designed to allow travelers to secure their luggage while still permitting government security agencies to inspect it without damage. These locks feature a distinctive red diamond logo (the Travel Sentry mark). While the traveler uses a combination or a personal key to open the lock, the Transportation Security Administration (TSA) and customs officers in many countries possess universal master keys that can open these specific locks. If a bag is flagged for a manual search during X-ray screening, officers can use their master key to open the bag, perform the inspection, and relock it. If you use a non-TSA approved lock and your bag requires an inspection, security personnel are authorized to cut or break the lock to gain entry, often leaving your suitcase unsecure for the remainder of the journey. In 2026, these locks are standard on almost all major luggage brands and are recognized by security agencies in the US, Canada, Japan, and most of Europe.