Master Lock Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey
Best for
Best portable travel safe
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Current price
$17.97
Updated Jun 27, 2026 · 1 min read
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the verified-purchase reviews we read, the Master Lock 5900D is a different animal from the rest of this roundup, a portable lock box rather than a padlock, with a 4.3 average over roughly 17,900 ratings. Reviewers use it to secure phones, wallets, and keys at the beach, gym, or hotel by tethering it to a fixed object via its cable, and the set-your-own combination and metal box construction are the features most often highlighted. We include it because it answers a genuinely distinct need that a zipper padlock can't.
What reviewers liked
- Distinct portable lock-box format for securing phones, wallets, and keys
- Large ~17,900-review base
- Tethering cable and set-your-own combination praised by reviewers
Where it falls short
- 4.3 average indicates a meaningful share of mixed feedback
- No independent testing supplied to verify the box's security
- Deterrent against opportunistic theft only, not a hardened safe
Embed our score
Sell this product? Show off the rank.
Free badge for the brand, retailer, or anyone covering this product. Copy the snippet and paste it anywhere HTML works. Updates automatically when the ranking changes.
Includes a credit link back to this page. No tracking; no JavaScript.
Across the verified-purchase reviews we read, the Master Lock 5900D is a different animal from the rest of this roundup, a portable lock box rather than a padlock, with a 4.3 average over roughly 17,900 ratings. Reviewers use it to secure phones, wallets, and keys at the beach, gym, or hotel by tethering it to a fixed object via its cable, and the set-your-own combination and metal box construction are the features most often highlighted. We include it because it answers a genuinely distinct need that a zipper padlock can't.
The 4.3 average, like the 4688D, suggests a non-trivial share of reviewers report niggles, and no independent testing or specialist-community discussion was supplied to corroborate its security. As a portable safe it's best understood as a deterrent against opportunistic grabs rather than serious protection, but for travelers wanting to stash small valuables out of sight it's the most-reviewed option of its kind here.
- Small safe is ideal for use as a travel safe or personal safe for protection and security from theft
- Secure small safe to a fixed object with cable; Portable safe is best used to protect smart phones, passports, cash, and credit cards
- Set your own four-digit combination portable safe; Ear bud/charging cable access port to conveniently listen to music or charge devices while locked
- Constructed with a shock absorbing foam, small lock box is designed to be water-resistant
- Exterior dimensions
- 2-1/4 inch H x 9-17/32 inch W x 4-59/64 D; Interior dimensions: 1-1/4 inch H x 8-1/8 inch W x 3-1/2 inch D
If the consensus convinced you
Check current price on Amazon
Pricing and availability change frequently. Tap through to confirm before buying.