Lock your luggage only with a TSA-approved lock, or don't lock it at all

A regular padlock on your checked bag will be cut off by TSA agents if they need to inspect the contents. A TSA-approved lock has a special keyhole that allows agents to open and re-lock it without damaging your bag. If you use a regular lock, you lose the protection it offers — TSA will straightforward cut it.

For carry-on bags, locking is less relevant because you keep the bag with you. TSA does not need to open carry-on bags at security; they screen them by X-ray. You can use any lock on a carry-on bag if you want to, since TSA agents will not cut it open during screening.

The real question is whether locking your checked bag actually protects it. The answer is limited: a TSA-approved lock deters casual theft by baggage handlers or other travelers, but it does not prevent determined theft and it does not protect against loss or damage.

Key Takeaways

  • TSA-approved locks allow TSA agents to inspect your bag without cutting the lock, while regular padlocks will be destroyed if your bag is selected for screening.
  • A lock on checked luggage deters opportunistic theft by baggage workers or other travelers, but does not prevent a determined thief or protect against airline mishandling.
  • Carry-on bags do not require locks because TSA screens them by X-ray and will not open them during security screening.
  • The biggest risk to checked luggage is loss or damage during transport, which a lock cannot prevent and which airlines handle through their own liability rules.

How TSA screening works with locked bags

When your checked bag arrives at the airport, it goes through an automated X-ray screening system. If the image is unclear or an agent wants to physically inspect the contents, TSA opens the bag. If you have used a regular lock, the agent cuts it off with bolt cutters. If you have used a TSA-approved lock, the agent opens it with a special key and re-locks it when done.

TSA-approved locks are marked with a red diamond logo or the words "TSA-approved." Common brands include Samsonite, American Tourister, and Delsey, though many luggage manufacturers now build TSA locks directly into their bags. You can also buy standalone TSA locks for under $15.

The chance your bag will be opened for inspection depends on the airport, the route, and random selection. High-traffic international routes see more inspections than domestic flights. If your bag is screened and you have used a regular lock, you will find it cut off and your bag re-sealed with a plastic TSA notice.

What a lock actually protects against

A lock deters opportunistic theft — a baggage handler or another traveler who sees an unlocked bag and takes something quickly. It does not stop a determined thief with tools, and it does not protect against the main risks to checked luggage: loss, delay, or damage during handling.

Airlines are not responsible for theft from checked bags in most cases, even if the bag was unlocked. They are responsible for loss or damage to the bag itself, but their liability is capped — usually around $2,800 per bag on domestic flights, though this varies by airline and ticket type. A lock does not change this.

If your bag is lost or delayed, the lock is irrelevant. If your bag is damaged during transport, the lock did not cause it and will not help you recover the cost. The lock's only real function is to make your bag a less attractive target for someone with a few seconds and no tools.

Carry-on bags and locking

You keep your carry-on bag with you from check-in through boarding, so theft is less of a concern. TSA does not open carry-on bags during security screening — they use X-ray machines instead. You can lock a carry-on bag if you want to, and TSA will not cut the lock because they will not need to open it.

The practical reason to lock a carry-on is if you plan to leave it unattended in a hotel room or at an airport gate while you use the restroom. A lock makes it slightly harder for someone to open your bag quickly. It does not prevent theft of the bag itself.

International flights and customs screening

If you are flying internationally, your checked bag may be opened by customs agents in addition to TSA. Customs agents in other countries do not have TSA keys, so they will cut any lock they encounter. Use a TSA-approved lock only if your final destination is the United States. If you are traveling to another country, a lock offers no real benefit because customs will cut it anyway.

Some travelers skip locks entirely on international flights for this reason. Others use a TSA lock on the outbound flight (TSA may screen it) and accept that customs will cut it on arrival.

What to put in checked luggage to reduce theft risk

A lock is one layer of protection, but the most effective strategy is to not pack valuable items in checked luggage at all. Carry electronics, jewelry, medications, and important documents with you in your carry-on bag. Checked luggage should hold clothes, shoes, and toiletries — items that are harder to sell quickly and less likely to be stolen.

If you must pack valuables in checked luggage, use a TSA-approved lock and consider purchasing baggage insurance through your airline or a third-party provider. Baggage insurance covers loss and theft, though it usually has a deductible and may not cover high-value items without a receipt.

TSA-approved locks vs. regular locks: cost and availability

A TSA-approved lock costs $10 to $20 and is available at most luggage stores, travel retailers, and online. A regular padlock costs $5 to $10 but will be cut off if TSA needs to screen your bag, leaving your luggage unsecured for the rest of your trip.

If you fly more than once or twice a year, a TSA lock is worth the cost. If you fly rarely, a regular lock is cheaper but riskier. Many modern luggage sets come with a built-in TSA lock, so you may already have one.

Frequently Asked Questions

Will TSA cut my lock if I use a regular padlock?

Yes. If TSA needs to inspect your bag and finds a regular lock, agents will cut it off with bolt cutters. Your bag will be re-sealed with a plastic TSA notice, but the lock will be destroyed and your bag will be unlocked for the rest of your journey.

Can I lock my carry-on bag?

Yes, you can lock a carry-on bag with any type of lock. TSA will not cut it because they screen carry-on bags by X-ray and do not open them during security screening. A lock on a carry-on is useful only if you plan to leave the bag unattended in a hotel or other location.

Does a lock prevent my luggage from being lost?

No. A lock does not prevent loss or delay during transport. Airlines lose luggage due to misrouting, missed connections, and handling errors — none of which a lock prevents. If your bag is lost, contact the airline's baggage service office, not the lock manufacturer.

What should I do if my bag is opened by customs and the lock is cut?

Document the damage with photos and report it to the airline before you leave the airport. Keep the TSA notice or any customs notice left in your bag. If the lock damage caused other items in the bag to be damaged, include that in your report. The airline may reimburse you under their baggage liability policy.

Is baggage insurance worth buying if I use a TSA lock?

Baggage insurance covers loss and theft, which a lock does not prevent. If you are packing high-value items, insurance is worth considering. Most airline insurance has a deductible and a per-item limit, so read the terms before you buy. For most domestic trips with standard luggage, insurance is optional.