Master Lock Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey
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Availability:
In Stock.
Arrives
Friday, Feb 13
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Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
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
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.
Brand: Master Lock
Product Dimensions: 3.5"D x 9.31"W x 2.25"H
Lock Type: Combination
Color: Gunmetal Grey
Capacity: 0.08 Cubic Feet
Material: Multi
Special Feature: Portable
Mounting Type: Freestanding
Included Components: 1
Item Weight: 0.71 Kilograms
Brand: Master Lock
Product Dimensions: 3.5"D x 9.31"W x 2.25"H
Lock Type: Combination
Color: Gunmetal Grey
Capacity: 0.08 Cubic Feet
Material: Multi
Special Feature: Portable
Mounting Type: Freestanding
Included Components: 1
Item Weight: 0.71 Kilograms
Alarm: Audible
Water Resistance Level: Water Resistant
UPC: 071649147784
Global Trade Identification Number: 84
Manufacturer: Master Lock
Part Number: 5900D
Item Weight: 1.56 pounds
Item model number: 5900D
Is Discontinued By Manufacturer: No
Size: 9.8 x 5.5 x 2.6 inches
Style: Portable Travel Safe
Finish: gunmetal
Pattern: Lock Box
Item Package Quantity: 1
Special Features: Portable
Batteries Included?: No
Batteries Required?: No
Warranty Description: One year limited warranty
Date First Available: August 31, 2011
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Feb 13
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
Much bigger than I thought originally! Great quality and very excited to gift this to my brother in law. Waterproof, has a lock combination and even has a spot to put your headphones while in use without getting anything wet on the inside. Fantastic for anyone and on the go!!! Would highly recommend and buy again.
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Reviewed in the United States on December 21, 2025 by Alexis
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
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!
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Reviewed in the United States on December 5, 2025 by Deb Thornton
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
Love the safe. Works well on my trips. I do wish it was just a little bit wider. I had to take my passport out of the holder for it to fit. That is my only con at the moment.
Reviewed in the United States on December 2, 2025 by TMHILL
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
Perfect for a beach vacation! This lock box is compact, easy to set your own combination, and keeps valuables safe while you’re out in the sun. Sturdy, well-made, and very convenient—fits small items like keys, cash, or cards. Makes me feel secure while enjoying the beach!
Reviewed in the United States on December 28, 2025 by Gordon S.
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
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!
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Reviewed in the United States on May 14, 2025 by JohnAstros
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
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.
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Reviewed in the United States on August 28, 2012 by donbodadonbo
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
Great solution for securing your personal items to your beach/pool chair while you take a dip. Took this along on a cruise and it was great poolside and also could be a great in-room safe if one isn’t provided for you.
Reviewed in the United States on January 17, 2026 by Amazon Customer