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In-depth review

Master Lock 4688D Cable Combination Lock Review (2027)

The Master Lock 4688D is the long-running silver cable combination lock. Our research verdict on the single-bag classic.

TGBy TrueGear Research TeamIndependent editorial teamLast updated How we researchResearch-based assessment · Luggage Locks
Specs verified against manufacturer docs
No paid placements
Independently funded by readers
Updated 2026-11-04
Master Lock 4688D Cable Combination Lock Review (2027) featured graphic
Master Lock 4688D Cable Combination Lock, Silver, Single

Master Lock 4688D Cable Combination Lock, Silver, Single

The long-running single: a silver cable combination lock with a flexible braided steel shackle.

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Our verdict

The 4688D is the lock equivalent of a reliable old suitcase: not the most feature-rich, not the prettiest, but the one travellers replace like-for-like when it finally wears out. A flexible braided steel cable shackle fits pulls that rigid locks cannot, a 1-3/16 in metal body feels solid for its size, and a limited lifetime warranty backs a maker with decades in this category. Its limits are the single's limits: one lock, one bag, and a 3-digit code that is a deterrent rather than serious security. For exactly one bag, it remains the safest single buy here.

What we like

  • 1-3/16 in metal body with a vinyl-covered flexible braided steel cable shackle, per the maker
  • Cable shackle flexes through zipper pulls and absorbs baggage handling better than a rigid loop
  • Set-your-own 3-digit combination, preset to 0-0-0 from the factory
  • Limited lifetime warranty from a maker with a long luggage-lock history

What to watch out for

  • A single lock covers a single bag, so families end up buying several
  • The silver finish shows scuffs from baggage handling sooner than a dark finish
  • Three digits are a deterrent, and a patient thief can work through 1,000 codes

What owners report: Master Lock 4688D Cable Combination Lock, Silver, Single

Synthesized from recurring themes in long-term owner feedback.

Most praised

  • Owners say this is the lock they replace like-for-like when an old one finally wears out
  • The flexible cable gets credit for fitting bags that rejected rigid shackle locks
  • Travellers like that the lock is small enough to leave attached to a bag between trips

Common complaints

  • Some owners struggle with the reset sequence and set a code different from the one they intended
  • A few report the vinyl cable cover cracking after years of use
  • Owners note the dials are small for travellers with large hands or stiff fingers

Who it is for

One-bag travellers who want a proven, inexpensive cable combination lock from a long-established maker.

Why the cable matters more than the body

The 4688D's flexible cable shackle is its real feature. A rigid shackle needs a pull with a clear, open loop; a vinyl-covered braided steel cable bends through pulls, loops and hasps that a rigid loop cannot enter, and it absorbs the tugging of baggage handling without levering the lock body. That flexibility is why this lock fits bags that defeat newer, stiffer designs, and why it has survived in the range for so long.

The reset sequence deserves patience

The most common owner complaint about this lock is not the lock but the reset: rushing the sequence sets a code different from the one intended, and the traveller discovers the error at the worst moment. The fix is dull and effective: set the code at home, test it three times, lock and unlock the bag twice, and only then pack. A lock whose code was tested at home is a lock that will open at the destination.

Where it sits in the range

Against the Forge four pack, this lock loses on value for families and wins on simplicity for a single bag. Against keyed locks, it wins on keylessness and loses on forgotten-code risk. Against the ZHEGE 4-digit single, it wins on history and warranty and loses on code range. That middle position is its appeal: the default single, bought without a debate.

Key specifications

Model
4688D
Body
1-3/16 in (30 mm) wide metal body
Shackle
1-1/2 in (38 mm) vinyl-covered flexible braided steel cable, 1/8 in diameter
Combination
Set-your-own 3-digit
Acceptance
TSA-accepted
Warranty
Limited lifetime warranty, per maker

Also consider

ZHEGE 4-Digit Cable Lock, Black, Single

ZHEGE 4-Digit Cable Lock, Black, Single

The single-bag upgrade: a 4-digit cable lock for travellers who want more codes than a 3-digit lock gives.

Why consider it: The 4-digit single alternative, for travellers who want a wider code range

  • Lock type: 4-digit resettable combination, cable
  • Cable: Flexible cable
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Research-based assessment. TrueGear has not hands-on tested this product; this evaluation synthesizes manufacturer specifications, retailer documentation, and published expert reviews.

Questions, answered

What is the factory code?

The lock is preset to 0-0-0 from the factory. Set your own code before first travel, following the maker's steps, and test the new code several times before packing.

Does the cable fit all zipper pulls?

It fits far more pulls than a rigid shackle, thanks to its flexible braided cable, but extremely slim or recessed pulls can still defeat it. Test it on the actual bag before a trip.

Is the silver finish durable?

It shows baggage handling scuffs sooner than a dark finish, which is cosmetic rather than functional. Travellers who dislike visible wear should choose a black lock from this guide instead.

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