Master Lock 4688D Flexible Shackle TSA Lock review

The Master Lock 4688D ranks first because it pairs a $9.99 price with the most flexible fit of any combination lock here. Its braided steel shackle is 1-1/2 in (38 mm) long and 1/8 in (3 mm) thick, so it bends through zipper pulls that a short rigid shackle cannot reach, and the 1-3/16 in body comes in assorted colors that help you pick out your bag. You set your own three digit combination, so there is no key to lose, and Master Lock says the lock is recognized as TSA approved in 29 countries, which lets screeners open and relock it without damage. The trade-offs are clear on the spec sheet: three dials offer fewer combinations than the four-dial 4696D and 4691DWD, the price covers one lock only, and Master Lock's store ships only to the contiguous United States. Families who want several locks on one key should compare the 4689Q 4-pack. We compared documented features and published prices and did not test the lock.

Who it is for

most travelers who want one reliable combination lock

Price

$9.99 for one lock on Master Lock's US store as of November 2026.

Model: 4688D Service & Support Information Best Seller $9.99
Quoted from the vendor pricing page on November 14, 2026.

Key features

• Set-your-own three digit combination, so there is no key to carry
• Flexible braided steel shackle 1-1/2 in (38 mm) long and 1/8 in (3 mm) thick
• Body width of 1-3/16 in (30 mm) in assorted colors
• Recognized as a TSA-approved luggage lock in 29 countries, according to Master Lock
• TSA screeners can inspect and relock without damaging the lock

Strengths and weaknesses

• Strength: Lowest-priced Master Lock combination lock on this list at $9.99
• Strength: Flexible shackle threads through thick or tight zipper pulls
• Strength: Colored body makes a bag easier to spot on the carousel
• Weakness: Three dials give fewer combinations than Master Lock's four-dial models
• Weakness: Sold as a single lock, so two bags cost $19.98
• Weakness: Master Lock's store only ships to the contiguous United States

Key facts

• Price: $9.99
• Lock type: 3-digit resettable combination
• Shackle: Braided steel, 1-1/2 in long
• Body width: 1-3/16 in (30 mm)
• Pack: 1 lock

Where it ranks

Master Lock 4688D Flexible Shackle TSA Lock is No. 1 in our Best Luggage Locks verdict.