TSA-approved luggage locks, explained

A TSA-approved lock is an ordinary combination or key lock with an extra keyway that security screeners can open using a master key. If your checked bag is selected for a physical inspection, the screener unlocks it, inspects it, and relocks it — instead of cutting the lock off, which is what happens to a non-approved lock.

That is the whole value proposition, and it is worth being clear about what it is not: these locks are not high-security devices. They deter casual opportunism and keep zippers closed in transit. A determined thief defeats any luggage lock in seconds, and the well-publicized fact that master key patterns have circulated online means the TSA keyway itself is not a secret. Buy one to stop your bag being cut open and your zippers popping, not to secure valuables.

How to identify a genuine one

Two programs license the master-key systems US screeners carry, and a real lock carries one of their marks stamped on the body:

If a listing says "TSA approved" but no red diamond or torch appears on the lock body in the photos, treat the claim as unverified. Note also that the marks indicate the lock is recognized by screeners — the TSA does not endorse or sell specific brands.

Built-in locks versus padlocks

Most hardside cases now ship with a fixed TSA combination lock built into the shell, which is convenient and impossible to lose. The trade is that if the mechanism fails you cannot simply replace it — you are dealing with the manufacturer. Every hardside pick in our best hardside luggage roundup notes whether it has one.

Separate TSA padlocks suit softside bags and duffels with two zipper pulls, cost very little, and can be moved between bags. The downside is the obvious one: they get lost, and a padlock hanging off a zipper can be levered.

What a lock does not protect against

• Zipper bypass. A standard coil zipper can be opened with a ballpoint pen and then re-zipped, leaving the lock untouched. This is a property of zippers, not locks.
• Determined theft. Any luggage lock is a low-security device by design.
• Loss or mishandling. A lock does nothing about the far more common problems.

The genuine defense against zipper bypass is a bag with a frame-and-latch closure rather than a zipper — the reason serious travelers gravitate toward latching aluminum and premium hardside cases. For most people, that is more money than the risk justifies.

Practical rules

1. Never put valuables in a checked bag. Laptops, jewelry, medication and documents belong in the cabin, lock or no lock.
2. Set a combination you will remember and record it somewhere other than the bag.
3. Check the lock is TSA-recognized before international trips — many countries' screeners use the same master-key systems, but not all.
4. Consider a numbered zip tie for pure tamper evidence. It costs pennies, cannot be relocked by anyone, and tells you instantly if the bag was opened.
5. Lock the zipper pulls together, not to the handle — that is what keeps the bag closed if it is dropped.