Master Lock Small Travel Safe with Cable, Gray Combination Lock Box, 5900D
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Availability:
In Stock.
Arrives
Friday, Aug 21
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 kg
Brand Name: Master Lock
Included Components: 1
Model Number: 5900D
UPC: 071649147784
Global Trade Identification Number: 84
Manufacturer Warranty Description: One year limited warranty
Number of Items: 1
Number of Packs: 1
Unit Count: 1 Count
Item Type Name: Set Your Own Combination Portable Safe
Manufacturer: Master Lock
Manufacturer Part Number: 5900D
Lock Type: Combination
Additional Features: Portable
Mounting Type: Freestanding
Alarm: Audible
Water Resistance Level: Water Resistant
Control Type: Touchpad Control
Item Dimensions D x W x H: 3.5"D x 9.31"W x 2.25"H
Capacity: 0.08 cubic feet
Item Weight: 0.71 kg
Chamber Width: 8.13 inches
Chamber Depth: 3.5 inches
Chamber Height: 1 inches
Color: Gunmetal Grey
Material Type: Multi
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Aug 21
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
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.
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Reviewed in the United States on June 9, 2026 by Sarah L
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
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.
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Reviewed in the United States on March 11, 2026 by Amazon Customer
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
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
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Reviewed in the United States on August 6, 2026 by comfortable dave
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: Pink
Size: 9.8 x 5.5 x 2.6 inches
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.
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Reviewed in the United States on August 6, 2026 by Amanda_1015
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
This Master Lock Safe is SO COOL. I purchased this after some little punk stole my cell phone at a park. I set my phone down on a table for maybe five minutes while I was doing something, and a kid walked right off with it. People seen him but did not say anything until after because they thought it was his phone. Living in a bigger city now I decided that I should invest in this product since my boyfriend and I go to public parks often. The Master Lock Safe arrived on time and in a sturdy box. It is bigger than I expected, and I love that! I can fit all my necessities in there. The product details say it is water resistant too, and that was put to the test the first day we got it! My boyfriend and I went to the skate park and locked it to a bench. While it was locked up it started sprinkling and the safe got wet but my phone and everything inside was perfectly dry. There is even a tee-tiny hole on each side that you can run your headphones through if you want. The combination was easy to set and the buttons on it work fabulously. The inside of the safe has a foam like material that helps keep your stuff from banging around. I especially like how it has a lot of room to put your belongings in, but at the same time once its closed up its slender enough I can fit it into most of my purses and it fits in my boyfriends backpack perfectly. It is very lightweight for its size too; and it seems like for being plastic on some parts it would still hold up fairly well. Someone would have to really work on it to bust it open I think. The lock looks impressive but I'm a little worried about the hinges on the other side. I wouldn't use this for an at home safe, because I need something a bit tougher and bigger than this for my home. But it is perfect for setting your stuff down and locking it up at a playground, water park, fair, party, untrustworthy roommate situation, work, etc. Overall this is an excellent portable safe, and I would recommend to others.
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Reviewed in the United States on July 3, 2016 by Stephanie🖤
Color: Gunmetal Grey
Size: 9.8 x 5.5 x 2.6 inches
It’s absolutely perfect except the freaking numbers are so difficult to rotate
Reviewed in the United States on June 18, 2026 by Kristopher Stevens