At Product Review
Master Lock 5900D Review 2025: Secure Your Valuables Anywhere

In 2024, nearly 1 in 3 Americans reported being scammed, with an average loss of $1,600 per victim. Additionally, 25% of American adults have experienced package theft, with 14 million incidents occurring in just three months. These statistics highlight the growing need for portable security solutions to protect personal valuables.

As someone who frequently travels for both work and leisure, I’ve personally tested the Master Lock 5900D Portable Safe to safeguard my essentials. This compact safe offers a practical way to secure items like passports, smartphones, and wallets, whether you’re at the gym, office, or on vacation.

In this review, I’ll share my firsthand experience with the Master Lock 5900D, covering its design, functionality, and real-world performance. By the end, you’ll have a clear understanding of whether this portable safe meets your security needs.

Key Takeaways

  • A Master Lock lockbox is perfect for travel and other circumstances, as it allows you to keep your smallest valuables safe from harm.
  • Master Lock is an established company that has been operating for over 100 years.
  • The lock box is small enough to carry with you on vacation or any travels.
  • You can set your own 4-digit code in order to make it even easier to operate.
  • The lock box is water resistant with special ports for charging or headphone cables.

Overview of Master Lock 5900D

The concept behind the Master Lock 5900D is simple: it is essentially a small safe you can carry around with you. If you’re traveling (or leaving the house for any reason), it can be difficult to keep things like your keys, passport, or electronics safe from harm.

The 5900D allows you to group your small valuables together in a casing that is secure, durable, and water-resistant. There is a bit more to it than that, and we will cover all of the features and benefits this lock box has as we proceed through the review.

For a quick look at the Master Lock 5900D in action, you can check out this short and informative promotional video.

Why You Should Consider a Master Lock Portable Small Lock Box

Combination safes, locks, and other secure devices have become rather popular in recent years. We have previously looked at products such as the Eufy video smart lock that is perfect for home security. That product is great for the door of your home, but what about when you leave your house?

There are a few items we all tend to carry, items that we want to keep safe. These include things like smartphones, wallets, and other electronics; it can be nerve-wracking to try to keep them all safe from theft and harm.

This is especially true when traveling long distances via plane, as the likelihood of theft and damage increases exponentially. The Master Lock portable lock box offers a great solution to this problem.

This product not only allows you to keep your valuables in one convenient location but also keeps them safe from damage, loss, or tampering. The box is especially handy for travel but could also be great for everyday use.

Master Lock 5900D Review

About the Master Lock Brand

When considering whether to purchase products from a company, it’s always reassuring to know that the company is well-established and has been around for a long time. This is certainly the case with Master Lock, as they have been around for over 100 years. It has allowed them a lot of time to master (no pun intended) their product range, and this longevity shows why they have endured for so long.

Master Lock 5900D

Key Features and Benefits

  • Small Size- The lock box is small enough to be highly portable, making it ideal for travel or work usage.
  • Cable Attached- Attached to the lock box is a durable cable. It can be used to secure the box to something temporarily or as a carrying strap.
  • Customizable Code- The 4-digit code to unlock the box can be easily customized. This ensures that you can use a code that you will never forget.
  • Access Port- There is a convenient cable port so that you can charge devices or listen to music even when the lockbox is closed.

Design

The design of the 5900D is simple and efficient. As mentioned, the box is small and portable, and it has dimensions of 5.1″D x 9.41″W x 2.2″H. It has a pill-shaped design with a sleek black and grey color scheme, which means that it won’t draw too much attention.

Small and Compact

Sometimes, you may want a larger safe to keep your possessions safe. However, the 5900D is designed for travel and convenience, so its small size makes it perfect for these purposes. The dimensions are small enough that you can fit it easily in a backpack, carry-on, or perhaps even a large pocket.

Performance and Reliability

The 5900D lock box is pretty simple, but this simplicity leaves a much smaller margin for error. It is durable and portable with great features. Everything works well thanks to the sturdy construction.

You can rely on the lock box to keep your valuables safe from most harm, and you can ensure it is always by your side thanks to its portability.

Set Your own 4-Digit Code

There are so many passwords and codes we need to learn in our everyday lives, so it’s always great when we can set them ourselves. This is the case with the 5900D, as you can set your own personal 4-digit code to have a code you will easily remember.

Customer Service and Support

Even when a product is of high quality and can be relied upon, you may find yourself running into issues. If you do, then it is easy to contact Master Lock for assistance, or you can try to solve the problem yourself using their comprehensive support page.

If you need more specialized support, you will find options to contact them via phone or with a support ticket on their contact page.

Pros and Cons

Pros

  • Small and portable.
  • Durable.
  • Customizable code.
  • Water-resistant.
  • Access port.

Cons

  • May be too small for some devices or objects you may want to carry with you.

Water Resistant, Ear Bud/Charging Cable Access Port

Water damage can be catastrophic to electronic devices and certain documents, so the 5900D is water resistant to protect anything inside from potential water damage. Additionally, there is a convenient access port built into the case.

This will allow you to store something like a smartphone inside it while still having the ability to charge it or have headphones plugged in.

A Brief Look at the Competition

You also have options such as the Amazon Basics Portable Security case which is more comparable to the 5900D. While it has its benefits, it’s a bit less versatile with what you can store, and the 3-digit code makes it slightly less secure.

Verdict

The big question at the end of this review is “Is the 5900D worth getting?” The quick answer to this question would definitely be a yes as far as we are concerned. While it’s not the fanciest, feature-rich accessory ever made, it does what it sets out to do admirably, and it will certainly help to keep your small valuables safer no matter where you may be.

Conclusion and Where to Buy

Traveling frequently for both work and leisure, I’ve become acutely aware of the vulnerabilities that come with carrying essential valuables. The surge in thefts, especially in bustling urban centers, underscores the necessity for reliable security solutions. For instance, London experienced a 150% increase in “snatch thefts” over the past year, with mobile phones being prime targets.

In my quest for effective protection, the Master Lock 5900D Portable Safe has proven invaluable. Its compact design and robust features have provided peace of mind during my travels. Beyond personal experience, data reveals that more than one-third of international travelers have had a tech device stolen while abroad. This statistic highlights the widespread nature of the issue and the importance of proactive measures.

The Master Lock 5900D addresses these concerns by offering a secure, portable solution for safeguarding personal items. Its user-friendly design and durability make it a practical choice for travelers and daily commuters alike. Investing in such security measures not only protects your belongings but also enhances your overall sense of security in an increasingly uncertain environment.

If you would like to purchase one for yourself, then you can find it on this Amazon product page for around $33.

Frequently Asked Questions

How Many Items Can Fit in Master Lock 5900D?

This will depend on the items and their size, but it should be large enough for 2-3 smaller objects.

Can a Bolt Cutter Cut a Master Lock?

Most bolt cutters would be ineffective against a Master Lock thanks to the design.

Can You Change the Combination on a Master Lock?

You can change the code on your Master Lock, as you can set your own 4-digit code.

Are Master Locks TSA Approved?

You should have no problems taking a Master Lock on most airlines.

Can You Open a Master Lock Without a Combination?

You will need to have the correct code in order to open the lock conventionally.