---
product_id: 2866268
title: "Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey"
brand: "master lock"
price: "€ 49.95"
currency: EUR
in_stock: true
reviews_count: 13
category: "Master Lock"
url: https://www.desertcart.be/products/2866268-portable-small-lock-box-set-your-own-combination-lock-portable
store_origin: BE
region: Belgium
---

# Water-resistant, shock-absorbing foam 4-digit combo lock Cable secures to fixed objects Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey

**Brand:** master lock
**Price:** € 49.95
**Availability:** ✅ In Stock

## Summary

> 🔐 Travel smart, lock tight, live worry-free.

## Quick Answers

- **What is this?** Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey by master lock
- **How much does it cost?** € 49.95 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/2866268-portable-small-lock-box-set-your-own-combination-lock-portable)

## Best For

- master lock enthusiasts

## Why This Product

- Trusted master lock brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tethered Safety:** Includes a durable cable to lock your safe to any fixed object, preventing theft.
- • **Rugged & Reliable:** Water-resistant design with shock-absorbing foam built for travel and daily use.
- • **On-the-Go Protection:** Compact yet spacious enough to secure smartphones, passports, and cash.
- • **Customizable Security:** Set your own 4-digit combination for personalized peace of mind.
- • **Music & Charge Friendly:** Earbud/charging port lets you stay connected while your valuables stay locked.

## Overview

The Master Lock 5900D Portable Small Lock Box offers a compact, durable, and water-resistant personal safe solution with a customizable 4-digit combination lock. Designed for travel and everyday security, it features a cable for securing to fixed objects and a convenient port for charging or listening to music while locked. Ideal for protecting smartphones, passports, cash, and credit cards, this gunmetal grey safe combines portability with trusted Master Lock reliability.

## Description

The Master Lock 5900D Set Your Own Combination Portable Personal Safe features durable construction made to withstand abuse and is water resistant. The safe measures 2-1/5in (57mm) H x 9-2/5in (23.9cm) W x 5-1/10in (13.1cm) D; and is ideal for recreation, campus, office, travel or leisure use. The safe includes a cable to wrap securely around a fixed object or use as a carrying handle. The Limited Lifetime Warranty provides peace of mind from a brand you know and can trust.

Review: Good quality safe - small safe that works great. Strong protection.
Review: Compact, secure, and travel-friendly – A must-have for peace of mind - I’ve used the Master lock portable small lock box locally and on 2 trips, Vegas and Cancun, and I can confidently say it’s one of the smartest purchases I’ve made for protecting my valuables. Whether I’m on the go, at the gym, at the beach, or just need a secure place to stash items in my car, this lock box delivers outstanding performance, durability, and peace of mind. The customizable 4-digit combination lock is easy to set and eliminates the hassle of carrying or potentially losing a key. The locking mechanism feels solid and responsive, giving me confidence that once it’s locked, it’s truly secure. It’s strong enough to deter opportunistic theft and gives me assurance when leaving items unattended in public settings. Don’t be fooled by the term "small" — the interior space is very well-designed. I can comfortably fit my phone, passport, small wallet, keys, and even some jewelry with room to spare. The foam lining inside is a thoughtful touch that prevents my items from shifting around or getting scratched. It’s also a good size for securing medication if needed. This lock box truly shines in its versatility: Beach trips: I loop the cable around a beach chair or inside my beach bag. I can swim without constantly worrying about my phone or car keys being stolen. Hotel stays: Not every hotel has an in-room safe, and this box is a great portable alternative. Car security: I’ve used it to store cash or spare keys in my car when I don’t want to carry them into the gym or on a hike. Airbnb or shared living spaces: It adds an extra layer of security for valuables when you're staying somewhere unfamiliar. The included cable loop is extremely handy — it allows you to secure the box to a fixed object like a bed frame, chair, railing, or inside your trunk. It’s coated in plastic to avoid scratches but still strong enough to resist cutting or tampering. The outer shell is made of impact-resistant ABS plastic, and the internal foam padding protects delicate contents from damage. It’s also water-resistant, which is a big plus for beach or outdoor use. It’s not waterproof, so I wouldn’t submerge it, but it can definitely handle splashes and light rain without issue. This is an excellent all-around lock box for anyone who values security, portability, and peace of mind. Whether you’re a traveler, student, athlete, parent, or just someone who wants an extra layer of security in unpredictable environments, this product is a fantastic choice. Pros: Customizable combo lock – no key needed Foam-padded interior to protect contents Water- and impact-resistant exterior Compact but holds a surprising amount Strong cable for tethering to fixed objects Affordable and well-built Cons: Not fireproof or waterproof (but not designed to be) Cable can be a little stiff at first use Would I buy it again? Absolutely. In fact, I’ve already ordered a second one as a gift!

## Features

- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005K6JQXQ |
| Additional Features | Portable |
| Alarm | Audible |
| Best Sellers Rank | #1,978 in Office Products ( See Top 100 in Office Products ) #6 in Security Lock Boxes |
| Brand | Master Lock |
| Brand Name | Master Lock |
| Capacity | 0.08 Cubic Feet |
| Chamber Depth | 3.5 Inches |
| Chamber Height | 1 Inches |
| Chamber Width | 8.13 Inches |
| Color | Gunmetal Grey |
| Control Type | Touchpad Control |
| Customer Reviews | 4.3 out of 5 stars 17,876 Reviews |
| Global Trade Identification Number | 00071649147784 |
| Included Components | 1 |
| Item Dimensions D x W x H | 3.5"D x 9.31"W x 2.25"H |
| Item Type Name | Set Your Own Combination Portable Safe |
| Item Weight | 0.71 Kilograms |
| Lock Type | Combination |
| Manufacturer | Master Lock |
| Manufacturer Part Number | 5900D |
| Manufacturer Warranty Description | One year limited warranty |
| Material | Multi |
| Material Type | Multi |
| Model Number | 5900D |
| Mounting Type | Freestanding |
| Product Dimensions | 3.5"D x 9.31"W x 2.25"H |
| Smart Home Compatibility | Not Smart Home Compatible |
| UPC | 071649147784 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Master Lock
- **Capacity:** 0.08 Cubic Feet
- **Color:** Gunmetal Grey
- **Included Components:** 1
- **Item Weight:** 0.71 Kilograms
- **Lock Type:** Combination
- **Material:** Multi
- **Mounting Type:** Freestanding
- **Product Dimensions:** 3.5"D x 9.31"W x 2.25"H
- **Special Feature:** Portable

## Images

![Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey - Image 1](https://m.media-amazon.com/images/I/717DzkodA8L.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: Would this hold about 10,000 cash. All one hundred bills?**
A: Forget the 10,000 how much monopoly money can it hold i don't want my family stealing from me when i go to the bathroom

**Q: What are interior dimensions?  Wondering if it would fit an ipad mini and kindle?**
A: No, it certainly would not hold a Kindle. I can close it with my car/house keys, my passport, my billfold and my Droid Razr cell phone inside, and maybe a couple of Krugerrands; that's about all. I just made some detailed measurements, and here's what I found:Height (maximum) 1.5", (minimum)1.0"Width at maximum height, 2.75"; at 1.0" height, 3.25""The ends are round and semi-circular; it could hold a narrow object 8.5" long, but the largest rectangular object would be about 6" long, 3" high, and 1" deep - roughly the size of a personal checkbook. I know this is a lot of answer. I hope it helps you, and anyone else who needs to know its inside dimensions.

**Q: Is the interior deep enough for 2 or 3 regular size prescription pill bottles?**
A: I just went and tried my prescription bottle in it and it fit.  My bottle is about 1.5-2 inches around and about 4 inches tall.  You could fit about 4 of them in there.  I hope this helps.

**Q: This is only waterproof, not fireproof or resistant?**
A: No small case like this, made out of anything, is fire resistant. small boxes have too little thermal inertia ie too much thermal transmission to be rated as fire proof or fire resistance. Anyone saying anything this size is fireproof is lying.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality safe
*by R***N on May 10, 2026*

small safe that works great. Strong protection.

### ⭐⭐⭐⭐⭐ Compact, secure, and travel-friendly – A must-have for peace of mind
*by J***S on May 14, 2025*

I’ve used the Master lock portable small lock box locally and on 2 trips, Vegas and Cancun, and I can confidently say it’s one of the smartest purchases I’ve made for protecting my valuables. Whether I’m on the go, at the gym, at the beach, or just need a secure place to stash items in my car, this lock box delivers outstanding performance, durability, and peace of mind. The customizable 4-digit combination lock is easy to set and eliminates the hassle of carrying or potentially losing a key. The locking mechanism feels solid and responsive, giving me confidence that once it’s locked, it’s truly secure. It’s strong enough to deter opportunistic theft and gives me assurance when leaving items unattended in public settings. Don’t be fooled by the term "small" — the interior space is very well-designed. I can comfortably fit my phone, passport, small wallet, keys, and even some jewelry with room to spare. The foam lining inside is a thoughtful touch that prevents my items from shifting around or getting scratched. It’s also a good size for securing medication if needed. This lock box truly shines in its versatility: Beach trips: I loop the cable around a beach chair or inside my beach bag. I can swim without constantly worrying about my phone or car keys being stolen. Hotel stays: Not every hotel has an in-room safe, and this box is a great portable alternative. Car security: I’ve used it to store cash or spare keys in my car when I don’t want to carry them into the gym or on a hike. Airbnb or shared living spaces: It adds an extra layer of security for valuables when you're staying somewhere unfamiliar. The included cable loop is extremely handy — it allows you to secure the box to a fixed object like a bed frame, chair, railing, or inside your trunk. It’s coated in plastic to avoid scratches but still strong enough to resist cutting or tampering. The outer shell is made of impact-resistant ABS plastic, and the internal foam padding protects delicate contents from damage. It’s also water-resistant, which is a big plus for beach or outdoor use. It’s not waterproof, so I wouldn’t submerge it, but it can definitely handle splashes and light rain without issue. This is an excellent all-around lock box for anyone who values security, portability, and peace of mind. Whether you’re a traveler, student, athlete, parent, or just someone who wants an extra layer of security in unpredictable environments, this product is a fantastic choice. Pros: Customizable combo lock – no key needed Foam-padded interior to protect contents Water- and impact-resistant exterior Compact but holds a surprising amount Strong cable for tethering to fixed objects Affordable and well-built Cons: Not fireproof or waterproof (but not designed to be) Cable can be a little stiff at first use Would I buy it again? Absolutely. In fact, I’ve already ordered a second one as a gift!

### ⭐⭐⭐⭐ Great for holding cash and very small things
*by J***R on March 31, 2014*

I began running a business out of my home that, quite often, results in our customers stopping by or meeting me somewhere and paying in cash. As business started picking up and I was holding more and more cash at any given time, it occurred to me that the adolescents in my house might not have quite learned the true meaning of a "business" and the ethics that are involved in distinguishing the difference between "Mom and Dad's money" and the "Business's money." Yeah, I know, it's terrible not to be able to trust your own kids, but what can you do? I gave it 4 stars because it functions just fine, and it's nice and compact so you can tuck it just about anywhere. It's a good little safe, and it has a built in security cord so you can tether it to something anchored if you needed to as well. The only reason I took a star off is because the rubber flap that covers up the dial is awkward to hold open when you are trying to work the combination lock, and, honestly, I don't like the color pink. And it is Pepto Bismol pink, no doubt. But I do support Breast Cancer Awareness, and if even a dollar of my purchase went there, then pink it shall be! Plus, for some reason, the pink Breast Cancer Awareness safe was less expensive than the basic black one... Can't figure that math out, but it works for me!

## Frequently Bought Together

- Master Lock Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, ‎5900D, Gunmetal Grey
- Apple AirTag 4 Pack

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-05-26*