Master Lock Portable Small Lock Box - Travel Safe for Phones

In this review the Master Lock Portable Small Lock Box is evaluated for travelers, dorm residents, and anyone needing a compact way to secure small valuables. The single biggest reason to consider it is straightforward: it offers a simple, cable-anchored portable safe with a user-set four-digit combination that protects phones, passports, cash and cards while remaining small enough to carry. For those prioritizing easy, temporary security and portability over heavy-duty protection, this lock box hits that sweet spot.

Key Features

• Portable security: The lock box secures to a fixed object with its cable so valuables stay anchored when left unattended.
• Custom combination: A four-digit user-set code removes the need for keys and lets multiple people access the box when needed.
• Device access port: The ear bud/charging cable access port allows listening to music or charging a device without opening the safe.
• Protective interior: Shock-absorbing foam cushions contents against knocks during travel or daily use.
• Water-resistant design: The small lock box is designed to shed light moisture, making it suitable for beach or poolside use.
• Dual-purpose cable: The cable doubles as a carrying handle and a way to wrap the box around a fixed object for added convenience.

Who It's For

The Master Lock Portable Small Lock Box is best for travelers, students in dorms, and beachgoers who need a lightweight way to keep phones, passports, cash and cards out of sight and attached to a fixed point. Its compact interior is ideal for people who carry a few small valuables and want a combination-based, keyless solution.

Shoppers who need a heavy-duty safe for firearms, large electronics, or long-term home storage should look elsewhere; this product is designed for short-term, portable protection rather than vault-level security. Also, larger items will not fit due to the modest interior dimensions.

Pros & Cons

Pros

• Compact and easy to carry while still allowing secure attachment to fixed objects via the cable.
• Set-your-own four-digit combination is convenient and removes key management concerns.
• Interior foam and a water-resistant build add practical protection for electronics and documents.
• Ear bud/charging cable access enhances usability while items remain locked inside.

Cons

• Interior space is fairly small, so larger phones, thick wallets or multiple items may not fit comfortably.
• Some users report mixed impressions about overall sturdiness, so it is not a substitute for a full metal home safe.

Specifications

Brand	Master Lock
Model	Portable Small Lock Box, 5900D (Pack of 2)
Exterior dimensions	2-1/4 in H x 9-17/32 in W x 4-59/64 in D
Interior dimensions	1-1/4 in H x 8-1/8 in W x 3-1/2 in D
Lock type	User-set four-digit combination
Features	Cable anchor, ear bud/charging access port, shock-absorbing foam, water-resistant design

Our Verdict

The Master Lock Portable Small Lock Box is a practical, value-oriented choice for people who need temporary, portable security for small items while traveling or at public venues. It balances convenience features like a cable anchor and charging port with protective foam and water resistance, though its small interior and mixed reports on sturdiness mean it is best used where light to moderate protection suffices.

Frequently Asked Questions

Can I change the combination?
Yes, the box uses a user-set four-digit combination so the code can be personalized.

Will a smartphone fit inside?
Smaller and many mid-size phones will fit, but larger phones or bulky cases may not due to the 1-1/4 in interior height and 3-1/2 in depth.

Is the cable secure enough to prevent theft?
The cable allows attachment to fixed objects and deters opportunistic theft, but this box is intended for portable, short-term security rather than high-security anchoring.