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🔐 Travel smart, lock tight, live worry-free!
The Master Lock 5900D Small Travel Safe is a compact, water-resistant lock box featuring a customizable 4-digit combination lock and a secure cable for anchoring to fixed objects. Designed for professionals on the move, it protects valuables like passports, smartphones, and cash while allowing device charging through a dedicated port. Durable and portable, it offers peace of mind with trusted Master Lock quality.























| ASIN | B005K6JQXQ |
| Additional Features | Portable |
| Alarm | Audible |
| Best Sellers Rank | #1,980 in Office Products ( See Top 100 in Office Products ) #5 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 18,189 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 Highlight | 2-1/4" H x 9-17/32"W x 4-59/64" D Portable Safe, Water Resistant for Travel, Beach, Dorm, Protects Cash, Phones, Jewelry |
| Item Type Name | Set Your Own Combination Portable Safe |
| Item Weight | 0.71 kg |
| 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 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Product Dimensions | 3.5"D x 9.31"W x 2.25"H |
| UPC | 071649147784 |
| Unit Count | 1 Count |
| Water Resistance Level | Water Resistant |
C**E
Handy Safe for travel cash
I think it is TSA compliant, have not taken it anywhere but home. It is small. maybe enough for a cellphone and some cash. I have been able to fit 400 dollars in one very easily. The attached cable is a think bike lock wire sort of affair. a pair of bolt cutters and it's game over. But for routine security, perfect. You wrap it around a sturdy base like a radiator or bathroom pipe and all is well. Changing the 4 digit code is fairly easy with just a screw driver. Keep in mind though nit only opens to like a 45 degree angle so do not try to force it all the way back. It's hard plastic, not metals and you will break it. The code reels are little rotary thumb disc with the number visible but not at low light. If you have chubby thumbs use your index fingers to spin it to the right digit. Perfect for hotel stays or for when your Uncle comes to visit. You know the one, seen only during funerals and holidays with large food and alcohol events. It is slim, maybe a cell phone or passport wide but plenty roomy for cash, foreign and domestic. over all not bad a the price is right. Plus you can change the combination as it suits you
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. It’s compact, sturdy, and perfect for securing important items like cash, IDs, keys, and small documents. I really appreciate the “set your own combination” 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. It’s 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!
T**S
Inexpensive peace of mind
This safe isn’t going to operate as though it were Fort Knox. I suppose it could be accessed after several good strikes with a hammer, but for me it’s going to do what I need it to do, a deterrent. I have medication and a handgun that I need to make sure my young and vulnerable grandchildren can’t accidentally access. This safe protects them for a very modest fee. The attached security cable can easily be secured to any fence, chair, table, or pole. The cable can also be used to carry the safe. It would take bolt cutters to break the strong cable. The safe arrives with the preset factory combination of 0000. The combination was easy to reset, especially if you read the simple instructions before hand. The only drawback that I’ve discovered is the combination dial. I found it difficult to move the dials and broke a fingernail. Minus this small glitch, I’m perfectly happy with my purchase.
J**S
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!
S**R
Small safe
Its small but is good for jewelry and cash. The lock is easy to use and understand. Hard case so no worries about things getting smashed. Worth the price.
S**L
love it!!
I own two of these because I loved my first one so much that I needed one for my mom’s house too. They are super easy to use and figure out while setting it up, and the perfect size!!! super easy to bring around or keep hidden somewhere in a room. These things don’t budge if you don’t put in the exact code!! Great quality, my only wish is it would be nice if the lid opened a little more than it does because it doesn’t open all the way up, it stops before even reaching a 90° angle.
G**S
Safety and Convenience
Nice Travel case for your valuables. It's compact, easily disguised, and not easily opened. Very handy.
A**5
Terrible lock mechanism
Won’t be buying again or recommending to others. It’s the right size for small valuables or money while on vacation but once you set the combination to open, to scramble the numbers once finished is almost impossible. They get stuck on the combination and nearly impossible to reset to 0000. I’ve had this less than a week and the paint on my numbers are already wearing. By 6 months I don’t think I’ll even be able to see the numbers.
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
F**O
Recomendo
Ótimo para guardar pertences pessoais, evitando incômodos!
S**R
Bad quality
The only metal parts are the lock panel / hinge and the cable. The rest of the container is plastic including the hinges, and feels like it could be easily pried open with a screw driver. The inner linings and outer lock cover come loose very easily. The packaging comes with a warning about material suspected of causing birth defects. There are better lockboxes available in metal for half the price.
C**E
Prodotto di qualità
In generale è composto da buoni materiali e da la sensazione di essere resistente. Pensavo fosse piu' pesante ma rimane molto leggero. Prima di comprarlo (Grazie Amazon per il buon prezzo trovato) mi sono imbattuto in alcune recensioni (probabilmente di vecchie versioni? o che avevano difetti?) sia qui che nella rete che vorrei sfatare: come nelle foto si può notare non ci sono spazi tra i numeri dove è possibile vedere e capire dove si fermi il pistone sul numero della combinazione scelta e la seconda non si apre nulla se non stati inseriti tutti e 4 numeri (in rete ho visto filmati dove riuscivano ad aprirla anche con 3). Per me, anche se con poco utilizzo, è un prodotto valido.
Trustpilot
1 month ago
1 day ago