






Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to Mexico.
๐ Travel smart, lock tight, live worry-free.
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.























| 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 |
R**N
Good quality safe
small safe that works great. Strong protection.
J**S
Compact, secure, and travel-friendly โ A must-have for peace of mind
Iโve used the Master lock portable small lock box locally and on 2 trips, Vegas and Cancun, and I can confidently say itโs one of the smartest purchases Iโve made for protecting my valuables. Whether Iโm 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 itโs locked, itโs truly secure. Itโs strong enough to deter opportunistic theft and gives me assurance when leaving items unattended in public settings. Donโt be fooled by the term "small" โ 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. Itโs 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: Iโve used it to store cash or spare keys in my car when I donโt 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 โ it allows you to secure the box to a fixed object like a bed frame, chair, railing, or inside your trunk. Itโs 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. Itโs also water-resistant, which is a big plus for beach or outdoor use. Itโs not waterproof, so I wouldnโt 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 youโre 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 โ 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, Iโve already ordered a second one as a gift!
J**R
Great for holding cash and very small things
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!
N**V
Strong and safe for valuables!
Love this!! 5 stars (dunno why one won't light up) Easy to use and holds small valuables/money. It would have to be smashed with something very heavy to break into - I don't think it could be easily broken into, so it is definitely sturdy, strong and safe. Easily fits into my night table drawer. Small enough to pack into a suitcase for travel. Highly recommend!
D**N
Perfect Little Safe for Peace of Mind!
The Master Lock Portable Small Lock Box has been an incredibly useful addition to our household. Itโs compact, sturdy, and perfect for securing important items like cash, IDs, keys, and small documents. I really appreciate the โset your own combinationโ feature - super easy to personalize and even easier to use. Its portable size makes it great for travel, dorm rooms, or just keeping valuables tucked away at home. Itโs lightweight but still feels durable and reliable. I love knowing that important items are protected without needing a big, bulky safe. The safe is easy to open and I find it very useful when traveling. Overall, this little lock box offers great security, convenience, and peace of mind. Highly recommend for students, travelers, or anyone who wants a simple and effective personal safe!
R**C
Highly recommend
Fantastic product. Works great - space for passport, car keys and $โs.
D**O
OK Price, But Very Small & Made of Plastic
MasterLock calls this a "Portable Safe" in the ad title, but that's stretching it a bit. It's more like a portable locked box than a safe, by any stretch of the imagination. I like its looks & parts of its design, but I don't like the fact that it's made of plastic (polycarbonate?). Although the shell is hard, it's not likely to withstand a hammer, drill, or screwdriver the way that metal would. The box has a rubber-like covering over the four dial combination lock, to "increase weather resistance & conceal the dials from view", but after opening & closing this cover twice, it no longer closes firmly, leaving one side of it partially open (the top side). So much for "increasing weather resistance & conceal the dials from view". All four of the dials on the lock are difficult to roll to the combination & off the combination; they resist movement too much, & are made of plastic without a grip, or much of a detent. Other such locks are rubberized or textured for a better grip, or have deeper detents for a place to put a fingernail. I expected it to be small, but it's actual interior dimensions are smaller than I thought they would be. For example, to give you an idea of the size, you can fit only two boxes of standard cigarettes inside in any formation, & that's pretty small. It might be useful for jewelry, money, an important folded up piece of paper, or other small mementoes, but due to the ease of breaking it open & walking away with this, I wouldn't trust it for anything of real value. MasterLock's packaging leaves something to be desired. It comes in a neat looking, strudy box, with a fold open lid, like a book cover. When you open the lid, one side of this box is visible (the side with the metal design on it). After that, as far as I could tell, you have to rip the box open, not very elegant. A simple opening would be more appropriate. Then, under the lock box, the one-sheet, folded manual is taped to the inside of the box. To remove the tape from the manual (so I could unfold it), the entire front page of the manual was ripped off by the tape. A thoughtless design on the part of MasterLock. For the price, this is not a bad deal, if you have a use for it. It would seem to make a good choice for teaching a child about combination locks, security, & protecting their valuables. For adult usage, I have a hard time figuring out what it could effectively be used for, considering the very small interior & the plastic construction. If it were found in a car, attached underneath a car seat, a thief might do more damage to the car (trying to dislodge the box) than it would be worth to you, in terms of protecting what is inside the box. I also bought the The Club LB200 Personal Vault Security Lock Box , which I've found to cost only a few dollars more, but it is of much better construction & is a larger size, without being too large. The Club LB200 is a much better buy than is this MasterLock box.
A**R
Adds a level of security
I like this box a lot. I feel a lot safer travelling with it. At the airport, it's nice to have my jewelry and passport, extra credit cards, etc. locked up when the lines are long (still carry cash in palms tho). At TSA, bags get stopped or stuck in the machine, and you don't know whose what is being gone through for a few minutes, it's nice to know they couldn't take advantage (not that I suspect that but it has been documented that there are some bad apples out there!). I've never been asked to open the box, so it must be fine to see through. And I like using it during my stays where there might not be a safe. The only thing is that if someone really wanted to steal the whole box, it probably wouldn't be that hard. The wire chain doesn't appear to be super robust.
N**N
Lockbox
Works as expected. Loved having mine on a trip. & can use for other purposes.
M**L
Sehr gut
Funktioniert sehr gut. Schloss hakt ein bisschen aber ansonsten top. Ich hoffe es muss nie seine Brandfestigkeit beweisen.
A**N
muy bueno
justo lo que pone el producto
M**H
Strong but lightweight
Take this every time I go on holiday - will deter the opportunist thief - well made
D**R
Fulfills its function
Fulfills its function. Might feel a bit cheap and plasticky but thatโs exactly what it was.
Trustpilot
2 months ago
5 days ago