TSA-Approved Locks for a Checked Bag: Which to Buy, and What the Spec Sheet Leaves Out

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The verdict

1. This page answers which TSA-approved lock to put on a checked bag. Whether a lock on a checked bag does anything at all is a separate question, and it is argued from the published evidence in do TSA locks actually work. Read that one first if you are still deciding; read this one if you have decided.
2. Buy on format, body material and how it attaches, because those are the only things anyone publishes. Master Lock's luggage category lists 53 products and lets you filter on shackle diameter from "3/32 in (2 mm)" to "5/16 in (8 mm)" — a dimension, not a strength rating. Its set-your-own-combination model is the one to start from, and you can check current Master Lock TSA lock prices on eBay, which lists it in multi-packs rather than the single units priced here. Eagle Creek's Travel Safe 3-Dial TSA Lock publishes "2.5 x 1.2 in. (6.5 x 3 cm)", "2.2 oz. (62 g)" and "Zinc Alloy" at "$15.00", and that is the whole spec sheet.
3. If your bag already has a lock built into the shell, that is usually the right answer. TSA publishes a photograph of "a collection of 244 locks pulled from under an airport baggage handling conveyor belt where the two belts come together" — "collected over a period of one month at a New York Airport." A lock moulded into the case is not in that pile.

What the mark is a promise about

Every recommendation below rests on one distinction, so it is worth stating before anything else. Every document quoted here was read on 22 September 2026, and every price is the maker's own as of September 2026.

TSA describes the arrangement in its own words: it "has worked with several companies to develop locks that can be opened by security officers using universal 'master' keys so that the locks may not have to be cut," and it tells travellers that "The packaging on the locks indicates whether they can be opened by TSA." The agency does not name a single brand anywhere on that page. It names a capability.

Travel Sentry, which owns the red-diamond mark, describes the same capability: "A TSA Lock is a luggage lock that can be opened by authorised security officers using special master keys," and its locks are "Used by security agencies in 80+ countries." The coding is granular — "Each lock has a special code TSA001 to TSA008, which is used by the TSA, CATSA and other security agencies to know which secure tool to use to open the lock." Safe Skies, the other approved system, puts the consequence of skipping the mark bluntly: "If your luggage is secured with a normal luggage lock, airport security will clip the luggage lock."

Air Canada states the rule from the carrier's side: "If you're locking your bag, you’ll need to use a security‑approved lock (e.g., Travel Sentry or Safe Skies) to avoid damage or delays. Non‑approved locks may be cut for inspection."

So the mark buys non-destructive inspection, and nothing beyond that is claimed by anybody. That is the frame to carry into the product pages.

The three formats, and which bag each suits

Approved locks come in three shapes, and the right one is decided by how your bag's pulls sit rather than by price.

A fixed-shackle padlock is the simplest. Master Lock lists its "TSA Lock with Solid Metal Body, 7/8 in Wide" at "$12.99" — a small body, which matters because a padlock threaded through two zipper pulls has to sit flat enough not to catch. Its wider sibling, the "Small Black Set Your Own Combination TSA Lock, 1-3/16 in Wide," lists at "$9.97 - 20.76."

A flexible-cable lock solves the geometry problem instead of the strength one. Master Lock's "Flexible Shackle Set Your Own Combination TSA Lock, Assorted Colors, 1-3/16 in Wide" lists at "$9.99." The cable reaches pulls that sit far apart, loops through a duffel's D-rings, and can tie a zipper to a frame. The shackle-length filter on that same page runs from "7/16 in (11 mm)" up to "2 in (51 mm)", which is the practical range you are choosing within.

A built-in lock is the third option and the one most hard-shell buyers already own. LEVEL8's Hegent check-in case advertises a "Dual TSA-approved Zipperless Lock" as a headline feature, and the checked 24-inch lists at "Checked 24" / Black - $299.99USD". A lock integrated into the shell cannot be snagged off a belt, which is the failure mode the loose ones actually suffer.

The failure nobody buys for

Read TSA's lock guidance to the end and the last paragraph is the useful one. "While our officers may have to cut locks from time to time, it's not the only reason your lock could be missing or damaged. Locks, along with your baggage, can also be damaged by airport conveyor belt systems" — and then the photograph of 244 of them, from one month at one airport.

That reframes the purchase. The likeliest thing to happen to a loose padlock is not that a screener cuts it; it is that a conveyor takes it. Travel Sentry's own advice points the same way: it "recommends buying baggage with 'kissing sliders' which hold the lock much more securely and minimize the effect of airline baggage handling."

So if you are buying loose locks, buy two and treat them as consumable. If you are buying a case, the lock point is a spec worth reading — Eagle Creek's wheeled duffels publish a "#10 lockable main zipper with large finger loop zipper pulls for easy access when wearing gloves," and its Migrate rolling duffel carries an explicit note that the "Travel Safe TSA lock shown in images is not included with this purchase." The lock in the product photograph is frequently a separate purchase; check before you assume otherwise. Which of those rolling bags is even legal at checked size is worked through in rolling duffels against the 62-inch ceiling.

What a lock's spec sheet contains

Here is the complete published specification for a typical approved padlock, quoted from the maker's own page. Eagle Creek's Travel Safe 3-Dial TSA Lock: "Travel Sentry™ Certified", "3 dial combination", external dimensions "2.5 x 1.2 in. (6.5 x 3 cm)", weight "2.2 oz. (62 g)", materials "Zinc Alloy", price "$15.00". That is all of it.

Master Lock's category page is richer in dimensions and no richer in anything else. It publishes body width, shackle material, shackle length, shackle width and shackle diameter as filterable attributes across "1 - 12 of 53 Products" — and no attribute anywhere describes how much force any of them resists.

Not one maker we read publishes a cut-resistance figure, a pull rating, or a defeat time. Travel Sentry states that "All Travel Sentry Approved locks must meet our standards that are much higher than the luggage locks on the market before 2003," but the standard itself is not published, so there is nothing to compare between two approved locks except the geometry. Buy the shape that fits your bag, in a metal body, and stop there.

Combination or key

Both exist under the mark, and the choice is genuinely small.

A combination lock has no key to lose, which is its whole argument. Travel Sentry's own padlock instructions run to "Step 9. Your combination is now set", and its advice on the code is worth taking literally: "Be sure to set a combination that cannot easily be guessed. Avoid 0-0-0 or 1-2-3." It also notes that if you have a combination model "you will NOT receive a key to open your lock. The key entry you see on the lock is designated for the security agents."

A keyed lock is faster at the carousel and adds one more object to your pocket. If you lose the key, Travel Sentry's answer is not encouraging: "There are thousands of different key combinations," and it refers you to the luggage brand or a locksmith. For a bag a screener may open without you present, the keyless dial is the lower-friction default.

Before the lock, the bag has to be legal

A lock is the last thing you put on a checked bag and the least consequential. The bag still has to clear the carrier's published box — Southwest states "62 inches in size (length + width + height)" with "Wheels and handles should be included when measuring." and "Up to 50 pounds each". The explainer for that total is the 62-linear-inch rule, the gap between a case's advertised size and its real one is in listed against exterior checked-bag dimensions, and you can check your own case against a carrier's box with our airline sizer tool.

If the lock is gone or the case is gouged on arrival, the question of who pays is not the lock maker's. That division is set out in what a luggage warranty covers and where airline damage goes. And the identification that actually gets a bag home is a separate purchase with its own published rules, covered in luggage tags for a checked bag. If you are still choosing the case the lock will ride on, the budget field is in our under-two-hundred checked round-up.

What we could not read

Master Lock's individual product pages rendered as empty shells to our requests, so the model names, widths and prices above come from its own luggage category listing rather than from each product's detail page. bagail.com returned 403 to our requests throughout this batch, so no accessory pricing from that brand appears here.

No maker publishes a strength, cut-resistance or defeat-time figure for any approved lock, and Travel Sentry does not publish the standard its approvals are measured against. Nothing here claims one lock is harder to break than another, because no document we read supports that comparison. Travel Sentry's own site also disagrees with itself on reach: its product page says "80+ countries" while its help centre says the system "is now also implemented in over 75 countries" and covers "over 750 US airports."

FAQ

Are TSA locks required on checked bags?

No airline we read requires you to lock a checked bag at all. What the airlines require is that if you do lock it, the lock is an approved one. Air Canada states that a security-approved lock such as Travel Sentry or Safe Skies avoids damage or delays, and that non-approved locks may be cut for inspection. TSA says the same from its side: if it cannot open a locked bag by other means, the lock may have to be cut.

What is the difference between Travel Sentry and Safe Skies?

They are two separate approved systems, and TSA carries master tools for both. Travel Sentry marks its locks with a red diamond and codes them from TSA001 to TSA008 so an officer knows which tool to use. Safe Skies is the other system and states that a normal, unapproved luggage lock will simply be clipped. Either mark gets you non-destructive inspection; neither is a security rating.

Should I buy a padlock or a cable lock for luggage?

Buy whichever one your bag's zipper pulls actually accept. A fixed-shackle padlock is tidier when two pulls sit close together; a flexible cable reaches pulls that sit apart and can loop through a duffel's rings. Master Lock publishes shackle lengths from roughly seven sixteenths of an inch to two inches across its luggage range, so measure the gap before you order.

Why did my luggage lock disappear even though it was TSA approved?

Because screeners are not the only thing that removes locks. TSA publishes a photograph of 244 locks recovered from under a single airport's baggage conveyor over one month, and notes that belt systems damage locks as well as bags. Travel Sentry recommends cases with sliders that hold a lock more securely for exactly this reason, which is also the argument for a lock built into the shell rather than one hanging off it.