Search  for anything...
Master Lock

Master Lock Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey

  • Based on 17,346 reviews
Condition: New
Checking for the best price...
$16.96 Why this price?
Save $7.03 was $23.99

Buy Now, Pay Later

As low as $4 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Sep 22
Order within 9 hours and 36 minutes
Available payment plans shown during checkout

Recently Viewed

Color: Gunmetal Grey


Size: 9.8 x 5.5 x 2.6


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: 5.3"D x 9.4"W x 2.54"H


Lock Type: Combination


Color: Gunmetal Grey


Capacity: 0.08 Cubic Feet


Material: Multi


Special Feature: Water resistant


Mounting Type: Floor Mount


Included Components: 1


Item Weight: 0.71 Kilograms


Brand: ‎Master Lock


Product Dimensions: ‎5.3"D x 9.4"W x 2.54"H


Lock Type: ‎Combination


Color: ‎Gunmetal Grey


Capacity: ‎0.08 Cubic Feet


Material: ‎Multi


Special Feature: ‎Water resistant


Mounting Type: ‎Floor Mount


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


Style: ‎Portable Travel Safe


Finish: ‎gunmetal


Pattern: ‎Lock Box


Item Package Quantity: ‎1


Special Features: ‎Water resistant


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: Monday, Sep 22

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Excellent Product for The Price, Kept My Stuff Safe & Dry
Color: Gunmetal Grey Size: 9.8 x 5.5 x 2.6
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. ... show more
Reviewed in the United States on July 3, 2016 by Stephanie🖤
    • Great product!
Color: Gunmetal Grey Size: 9.8 x 5.5 x 2.6
So far so good. Oughtnit gor my daughter for college. No complaints yet. Great concept for keeping valuable safe in her dorm.
Reviewed in the United States on August 23, 2025 by Michael Attinello
    • Good
Color: Gunmetal Grey Size: 9.8 x 5.5 x 2.6
Works well and keeps stuff safe on campus or on vacation. Wish it was slightly easier to use in the sense that the dials are extremely hard to turn but I guess that also makes it harder to break into. Overall- very good.
Reviewed in the United States on July 3, 2025 by Jenna D
    • Great for Securing Valuables
Color: Pink Size: 9.8 x 5.5 x 2.6 inches
Review Image by Markeyta Barrow Markeyta Barrow
This is a great portable safe. On vacation alone and I have no worries when I’m on a tour or have to leave my valuables unattended because they are secure in this box. I must admit I had a little difficulty setting my code because the switch kept popping back but once it was set it works as described. ... show more
Reviewed in the United States on August 30, 2025 by Markeyta Barrow Markeyta Barrow
    • Perfect for traveling
Color: Gunmetal Grey Size: 9.8 x 5.5 x 2.6
Love that I choose the code. Easy to use and open. Perfect size for husband wallet, my card holder, a phone, and car fob. Love that it has a cable to wrap around luggage, stroller, scooter or chair. Waterproof. Ease of mind that all was secure.
Reviewed in the United States on August 25, 2025 by Amazon Customer
    • It is cheap insurance to avoid a disaster like my puppy and myself nearly suffered!
Color: Gunmetal Grey Size: 9.8 x 5.5 x 2.6
My Jack Russell Terrier puppy broke into a “safe” pill box and at minimum chewed and spit out several painkillers. Only God knows what prevented her from being killed because it takes almost zero methadone and hydromorphon to kill. This is the best insurance to save a child or a pet. If you have any prescription or over the counter medication this is the best and least expensive way to prevent accidental poisoning and very possible death. ... show more
Reviewed in the United States on September 4, 2025 by Kevin Reeve
    • Larger than I thought
Color: Gunmetal Grey Size: 9.8 x 5.5 x 2.6
Bought this for a vacation to hold items at the beach/pool. Larger than I expected. Rubber seal over combination did not seal well after only a couple of uses. Holds a good amount of stuff. Fairly easy to use.
Reviewed in the United States on August 22, 2025 by Robert P.
    • Compact, secure, and travel-friendly – A must-have for peace of mind
Color: Gunmetal Grey Size: 9.8 x 5.5 x 2.6
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! ... show more
Reviewed in the United States on May 14, 2025 by JohnAstros

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...