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Every dimension published, at the lowest price here

Master Lock 4688D set-your-own combination lock

The only lock in this hub that publishes its body width, its shackle diameter and its shackle length — and the cheapest lock on the shelf.

Master Lock TSA approved combination luggage lock with its braided cable shackle

Master Lock 4688D set-your-own combination lock

The only lock in this hub that publishes its body width, its shackle diameter and its shackle length — and the cheapest lock on the shelf.

Amazon reference
B000WO84Z2
EAN
0071649054419
  • Publishes the body width, 30 mm (1.18 in), the shackle diameter, 3 mm (0.12 in), and the shackle length, 38 mm (1.50 in) — no other lock in this hub gives all three
  • A vinyl-covered braided steel cable rather than a rigid shackle, stated to resist baggage handling equipment
  • Does not mention the red-diamond TSA marking that this hub’s buying tip says to confirm — it says "TSA approved" and "TSA-Accepted"

Best for: A zip pair on a suitcase, where the cable has to be thin enough to pass through both pulls

≈ $6
Check price on Amazon

Specifications

Amazon reference
B000WO84Z2
EAN
0071649054419

This is the cheapest lock on the shelf and the best specified, which is not a combination that occurs often. Thirty millimeters of metal body, a 3 mm (0.12 in) shackle, 38 mm (1.50 in) long, in vinyl-covered braided steel rather than rigid bar — and every one of those figures is published, where seven other listings in this hub publish at most one.

The dimensions are the whole purchase. A suitcase zip pull has a hole a few millimeters across, and a lock whose shackle will not pass through two of them is useless however strong it is; a shackle too short will not reach round a pair of stiff pulls. Three millimeters through 38 mm (1.50 in) of length is the pairing that fits almost everything, and the vinyl sheath is there to stop the cable sawing at the zip pulls as the bag is thrown about.

What the page does not do is confirm the marking. It says “TSA approved” and refers to a “TSA-Accepted lock”, and this hub’s buying tip asks for the red-diamond indicator specifically — because a lock without it gets cut like any other padlock during a random inspection. None of the eight American listings on this shelf mentions the diamond, and the two European locks published here put “TSA-recognized” in their own specification. Three digits gives a thousand combinations, which is the floor on this shelf; the ZHEGE lock further up is the only four-digit one.

Availability

Read on the day this page was built: $6 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-07. The live price is at the top of the page.

What travelers ask

Why do the shackle dimensions matter?

Because they decide whether the lock fits at all. A suitcase zip pull has a hole of a few millimeters, and a shackle thicker than that will not pass through two of them; a shackle shorter than about 35 mm (1.38 in) will not reach around a pair of pulls on a stiff zip. Master Lock publishes 3 mm (0.12 in) diameter and 38 mm (1.50 in) length, which is the combination that works on nearly every case — and it is the only listing in this hub, either half, to publish both.

Is the red-diamond marking confirmed?

Not on this page. The listing says the lock is "TSA approved" and that "TSA screeners can open, inspect and relock bags locked with a TSA-Accepted lock". This hub’s buying tip asks you to confirm the red-diamond indicator specifically, because a lock without it can be cut off during an inspection like any padlock. None of the eight American listings on this shelf mentions the diamond; the two European locks already published here carry "TSA-recognized" in their own specification. For a Master Lock 4688 the marking is on the body, and the page is where it should have been said.

Which model is it?

The reference is 4688D and the product title ends 4688EC. Master Lock uses suffixes for pack and display variants of the same lock, so the mechanism is the same — but it is the Amazon reference below that identifies what ships.

More tsa locks

  • SURE LOCK TSA cable lock showing its red open-alert indicator

    SURE LOCK Open-alert cable lock, 2-pack

    A cable lock that records the inspection: a red indicator appears if the lock has been opened by a screener, and stays visible until you unlock it yourself.

    Amazon reference
    B073NYB7R2
    EAN
    0646648185114
    • An open-alert indicator that shows a red button once a screener has opened the lock, and stays shown until you unlock it
    • A braided steel cable, which threads zip holes and awkward bags a rigid shackle cannot
    • Does not mention the red-diamond TSA marking

    Best for: Knowing whether a bag was opened in transit, rather than guessing from a paper slip

    ≈ $12
    Check price on Amazon
  • ZHEGE four-digit TSA cable lock with its coiled steel cable extended

    ZHEGE 4-digit cable lock with 26 in cable

    The only four-digit lock in the American half of this hub, with a retractable 26-inch cable that secures two or three bags together.

    Amazon reference
    B07WF3TRYD
    EAN
    0824007401529
    • Four digits — 10,000 combinations, ten times a three-digit lock, and the listing says so correctly
    • A 26-inch self-retracting steel cable that secures two or three bags together, which no other lock here can do
    • Does not mention the red-diamond TSA marking

    Best for: A train, a hostel or an overnight coach, where bags have to be tied to each other or to something fixed

    ≈ $10
    Check price on Amazon
  • ZHEGE TSA 4-dial combination luggage locks

    ZHEGE TSA 4-Dial Locks 4-Pack

    A four-pack of TSA-recognized combination locks, confirmed for sale on three of the four European markets checked at review time.

    • Four locks in one purchase, covering a full set of family luggage
    • 4-digit combination gives more code combinations than a 3-digit dial
    • Not confirmed for sale on the Italian market under this exact listing at review time
    Search Amazon for this model

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    Amazon reference
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    EAN
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