Master Lock 5900D Portable Safe – Customize Your Combination Key Box


βœ… Editor’s Pick


πŸ›‘οΈ Safety, Health & Comfort


🐾 Comfort-First Design


🧼 Easy Hygiene

πŸ›‘οΈ Master Lock Portable Small Lock Box, Set Your Own Combination Lock Portable Safe, Personal Travel Safe, 5900D, Gunmetal Grey β€” Safety, Comfort & Current Price (Review)

This review focuses on comfort, usability, and everyday safety-related design detailsβ€”so it’s clear how this product supports a calmer,
cleaner, and more comfortable routine for dogs and owners.

🧭 How This Product Was Evaluated

  • πŸ›‘οΈ Safety-related design (stability, secure closures, reduced slipping where relevant)
  • 🐾 Comfort (padding, fit, pressure points, breathability)
  • 🧼 Hygiene & cleaning (washability, wipeable surfaces, odor control potential)
  • 🧱 Materials (durability + skin-friendly contact points)
  • 🧠 Ease of use (daily setup, adjustments, handling)
  • πŸ’° Value compared with similar safety/comfort-focused options

πŸ“Έ Product Images

Master Lock 5900D Portable Safe – Customize Your Combination Key Box

🐾 Comfort Check (What Matters Most)

  • 🧸 Padding/support where the dog rests or makes contact
  • 🌬️ Breathability for warmer conditions (if applicable)
  • πŸ“ Fit and adjustability for different sizes
  • 🧼 Materials that are easier to keep clean

πŸ›‘οΈ Safety Notes (Design-Focused)

  • πŸ”’ Secure closures and dependable attachment points (model dependent)
  • 🧱 Stability to reduce shifting during normal use (model dependent)
  • 🧼 Cleaner surfaces help support a more hygienic routine
πŸ“ For health concerns or special needs, product choice should match your dog’s condition and comfort requirements.


πŸ’° Current Amazon Price

πŸ›’ Price:
$23.99 - $17.97
πŸ•’ Updated: Dec 21, 2025 02:35:25 UTC Β·

Price & availability details


View current price on Amazon

πŸ“¦ The Amazon listing includes sizing, materials, care instructions, and buyer photos.


βš™οΈ Safety, Health & Comfort Overview

πŸ›‘οΈ Safety Design Secure, stable setup (model dependent)
🐾 Comfort Padding/support for everyday use
🧼 Hygiene Cleaner surfaces or washable parts (model dependent)
🧱 Materials Durability and skin-contact comfort (varies)
πŸ’° Value Competitive for its feature set


🌟 Pros & Cons

βœ… Pros

  • 🐾 Comfort-forward design for everyday use
  • 🧼 Easier maintenance and cleaning (model dependent)
  • 🧱 Solid materials for regular handling
  • πŸ›‘οΈ Stable/secure setup (model dependent)
⚠️ Cons

  • πŸ“ Fit/size selection matters for comfort
  • 🧩 Features can vary depending on model/size


πŸ“ Product Details

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.
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

🏁 Final Assessment

In the safety, health & comfort category, this product fits owners looking for a more comfortable and practical
everyday solution that supports cleaner routines and stable use. Performance is strongest when sizing and setup match the dog’s needs
and the product’s intended use case.

  • βœ… Best match: comfort-first, routine-focused owners
  • βœ… Best use: daily use, travel, calmer handling
  • βœ… Priority features: comfort, hygiene, secure design


❓ FAQ: Safety, Health & Comfort

Is this designed for comfort?

Yes. Products in this category typically focus on comfort, stable use, and day-to-day practicality.

Does sizing impact comfort?

Yes. Proper sizing affects fit, pressure points, and overall ease of use.

Is it easy to keep clean?

Cleaning depends on the model, but the category typically includes washable pads or wipeable materials.



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Prices and availability are subject to change.

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