Skip to content

Head to head

Forge Open Alert 4 Pack vs Master Lock 4688D (2027)

Forge's four-colour indicator pack against Master Lock's long-running single cable lock, for 2027 buyers.

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
Forge Open Alert 4 Pack vs Master Lock 4688D (2027) featured graphic

What owners report

Most praised
  • Travellers like giving each bag its own colour, which ends the nightly hunt for the right lock
  • The red indicator gets mentioned by flyers who want to know a bag was opened before they unpack
  • Owners say the dials are large enough to turn without glasses in a hotel room
Common complaints
  • Some owners find the shackle too thick for slim zipper pulls on lightweight bags
  • A few report the dials feeling stiff on the first few uses until they loosen up
  • Owners who set different codes per lock sometimes mix them up across a trip

What owners report

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

Our recommendation

Choose by bag count. If you travel with more than one bag, or with a family, the Forge four pack wins on value, colour coding and the inspection indicator, and it is not close. If you travel with exactly one bag and want the cheapest proven lock from a long-established maker, the Master Lock 4688D single is the right buy, and its flexible cable fits pulls the Forge shackle cannot. Both are TSA-accepted combination locks; the difference is pack logic, indicator visibility and shackle versus cable fit, not basic quality.

Pack logic

Forge sells a system: four locks, four colours, one pack, for a household or a set of bags. Master Lock sells a single: one lock, one bag, bought again when another bag joins the trip. The Forge pack is cheaper per lock and simpler to manage for several bags; the Master Lock single is cheaper in absolute terms and simpler for one bag. Count travelling bags before choosing.

Indicator versus no indicator

The Forge pack's red open alert indicator reports a screener inspection at a glance, while the Master Lock single gives no such signal. For checked bags, where inspection is a real possibility, that information has practical value: it prompts a contents check at the airport. For carry-on bags that are never out of sight, the indicator matters less.

Shackle versus cable fit

The Forge lock uses a rigid steel shackle, which is neater on hard cases but needs a pull with clearance for the loop. The Master Lock lock uses a flexible braided steel cable shackle, which bends through slim pulls and loops that reject a rigid loop. A traveller whose bags have slim pulls should buy the Master Lock single or the Forge cable pack, not the Forge shackle pack.

History and warranty

Master Lock's 4688D carries a limited lifetime warranty and a sales history measured in years, which is reassuring for a single-lock buyer. Forge's pack carries the brand's travel-lock reputation since 2015 and a four-lock value proposition. Neither history prevents the category's shared limits: both are 3-digit deterrents, not theft-proof barriers.

Choose Forge Open Alert Shackle Locks, 4 Colours, 4 Pack if…

  • You travel with several bags or a family
  • An inspection indicator matters to you on checked bags
  • Colour coding locks per bag appeals to you
  • Your bags' pulls accept a rigid shackle

Choose Master Lock 4688D Cable Combination Lock, Silver, Single if…

  • You travel with exactly one bag
  • Your bag's pulls need a flexible cable, not a rigid shackle
  • You want the cheapest proven single lock
  • A limited lifetime warranty from a long-established maker matters to you

Questions, answered

Can I mix the two, one of each?

Yes, and many travellers do: a Forge shackle pack for hard cases and a Master Lock cable single for the soft bag with slim pulls. Mixing by bag fit is smarter than forcing one lock type onto every bag.

Which is better for checked bags?

The Forge pack, because of its inspection indicator, provided the pulls accept a shackle. If the pulls need a cable, the Master Lock single or the Forge cable pack is the better checked-bag choice.

Do both use the same code system?

Both are set-your-own 3-digit combination locks, preset to 0-0-0 from the factory. Set and test the code at home before travel on either lock.

Every guide on Luggage Locks16 pages