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Sold by: Triplenet Pricing INC
Sold by: Triplenet Pricing INC
(82382 ratings)
70% positive over last 12 months
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Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)

4.5 4.5 out of 5 stars 12,212 ratings
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Amazon's Choice in Computer Cases by Cooler Master

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About this item

  • I/O panel can be adjusted in 6 different locations and the Case can be positioned: Vertical or horizontal
  • Edge to edge acrylic transparent side panel offers a full view inside
  • Body depth height: Can support normal size ATX power supply
  • Front magnetic design dust filter with open perforated front, top and bottom for high air performance
  • Extra space behind the motherboard tray for hidden cable management
  • Motherboard Support: Micro ATX, Mini ITX, CPU Cooler: 159mm/6.2", GPU 360mm, Radiator Support Front: 120mm/240mm, Rear: 120mm

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$39.99
Get it as soon as Tuesday, Mar 26
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WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

From the manufacturer

Header
MAIN

CM
Make It Yours.

We're all about the things that make building a PC such a rewarding experience. The sense of achievement. The joy of making and creating something uniquely yours in form and function and, of course, the thrill of bringing your creation to life without melting your components.

MasterBox Q300L

Choose Your Style

The MasterBox Q300L is your straightforward option in the MasterBox Q-series from Cooler Master, a series that might be small in size but excels in functionality, modularity, and thermal performance. The combination of a practical design and the unique customizable aesthetic makes the Q300L the perfect choice for office and home use.

  • Magnetic Dust Filters
  • 6-Orientation I/O Panel
  • Edge-to-Edge Acrylic Side Panel
  • Routing Space
  • Thermal Performance
  • ATX PSU Support
  • CPU Cooler: 159mm, GPU 360mm, Radiator Support Front: 120mm/240mm, Rear: 120mm
  • Motherboard Support: Micro-ATX, Mini-ITX

Magnetic Dust Filters

Modular I/O Panel

Versatile Cooling

Components Clearance

Magnetic Dust Filters

The Dust filter's special pattern gives the chassis a distinctive appearance.

Modular I/O Panel

The I/O panel offers versatile placement in six different locations. Whether at the front, top, or bottom on both sides, you have the flexibility to adjust its position.

Versatile Cooling

Stay ahead of the game with versatile mounting options. Take advantage of the opportunity to fit a liquid cooler of up to 240mm, ensuring optimal performance.

Components Clearance

This case supports CPU coolers with a maximum height of 159mm, graphics cards up to 360mm in length, and power supplies with a length of up to 160mm.

Spacious Interior

Open Thermal Design

Routing Space

Edge-To-Edge Side Panel

Spacious Interior

Experience a spacious interior that offers abundant room for Micro-ATX or Mini-ITX motherboards, allowing for easy installation, efficient cable management, and future expansion possibilities

Open Thermal Design

The perforated front, top, and bottom design ensures optimal thermal airflow, promoting excellent heat dissipation throughout the system.

Routing Space

A generous 28mm of space is provided behind the motherboard tray, allowing for efficient cable management and ensuring a clean and organized build.

Edge-To-Edge Side Panel

Display your meticulously crafted build with pride through the transparent side panel, allowing for a stunning showcase of your components and lighting effects.

Q300l ARGB GPU Bracket ML240L Core Hyper 212 Halo Halo² 120 V850 SFX Gold
Q300L ARGB GPU Bracket ML240L Core Hyper 212 Halo Halo² 120 V850 SFX Gold
Customer Reviews
4.5 out of 5 stars
12,212
4.6 out of 5 stars
890
4.6 out of 5 stars
11,268
4.7 out of 5 stars
7,519
4.8 out of 5 stars
40
4.5 out of 5 stars
1,043
Products M-ATX Tower Case MasterAccessory Liquid Cooler Air Cooler Fan Power Supply SFX
Compatible
Cooler Clearances 159mm 154mm
Radiator Clearances Up to 240mm 240mm
LEDs Addressable RGB Addressable RGB Addressable Gen 2 RGB Addressable Gen 2 RGB
Support ITX | M-ATX Full |ATX|M-ATX| Mini-ITX Case AMD AM5|AM4, Intel LGA 1700|1200|115X AMD AM5|AM4, Intel LGA 1700|1200|115X 120mm Case | Air Cooler |AIO 80 PLUS Gold | SFX 12V Ver. 3.42
Fans Up to 5x 120mm | 2x 140mm 120mm
Pre-installed Fans 1x 120mm PWM Dual 120mm ARGB PWM Halo² 120mm ARGB PWM Halo² 120mm ARGB PWM 92mm
GPU Dimensions 360mm
Dimensions (LxWxH) 387 x 230 x 381mm 58 x 58 x 177mm 277 x 119.6 x 27.2mm 124 x 73 x 154mm 120 x 120 x 25mm 100 x 125 x 63.5mm

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This Item
Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)
Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)
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Price$39.99$59.99-15% $54.99
List:$64.99
$64.99$94.99$49.99
Delivery
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Customer Ratings
Noise level
4.2
4.4
4.6
4.4
4.3
4.2
Quality of material
4.0
4.5
4.3
4.0
4.4
3.2
Easy to assemble
4.5
4.3
4.5
4.3
4.4
Easy to remove
4.4
4.7
4.3
4.5
4.2
Value for money
4.1
4.5
4.5
4.8
4.1
Sold By
Amazon.com
Amazon.com
Antec Prime
Amazon.com
Amazon.com
ZalmanUSA
case type
mini tower
mini tower
mini tower
tower
mid tower
full tower
motherboard form factor
Micro-ATX and Mini-ITX
Micro ATX
Micro ATX
Micro ATX/Mini ITX
ATX, Micro-ATX, Mini-ITX
material
Alloy Steel, Plastic
Tempered Glass, Plastic, Metal
Tempered Glass
Tempered Glass
Alloy Steel
cooling method
Fan
Air
Air
Air
Water, Air
Air
number of usb ports
2
2
3
3
3
3
fan count
3
5
1
2
2
1

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    Warranty & Support

    Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
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    Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)


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    Product Description

    The Master Box Q300L is your straightforward option in the lineup of the brand new Master Box Series from Cooler Master. A Series that might be small in size but excels in functionality and modularity without compromising on the thermal performance. Although the size wouldn't tell, the Master Box Q300L supports a standard ATX PSU which we don't see often in the market with this size. Based on the different system setup, the I/O panel can be adjusted to six different locations, three options at each side of the case. You can decide which setup fits your system best. Due to the cube design of the frame and special pattern design on the magnetic dust filter will make the chassis stand out from the rest. The combination of a practical design and the unique customizable outlook makes the Master Box Q300L The perfect choice for office and home.

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    12,212 global ratings

    Customers say

    Customers like the ease of construction, value, and appearance of the computer chassis. For example, they mention it's easy to configure, and the dust filters are cool looking. They appreciate the space and size. Opinions are mixed on airflow, quality, and magnetic filters.

    AI-generated from the text of customer reviews

    306 customers mention264 positive42 negative

    Customers like the value of the computer chassis. They mention it's a decent case for the price, a solid budget friendly case, and provides looks as well as functionality for a great price. Some appreciate the flexible quality and the washable magnetic dust. Overall, customers are happy with their purchase and recommend it to others.

    "...If you want looks as well as functionality for a great price, go with this case." Read more

    "...PSU lies about it being semi-modular, very solid quality and flexibility for the money and the washable magnetic dust filter covers are an awesome..." Read more

    "Very affordable case with lots of air flow and comes with a built in fan. Very good value for the money and doesn't look bad by any means...." Read more

    "...CONCLUSION: This is a very affordable case that is compact and high-airflow with no major issues...." Read more

    271 customers mention226 positive45 negative

    Customers like the appearance of the computer chassis. They say it offers a blend of style, functionality, and space efficiency. They also appreciate the acrylic side panel and well-painted case. However, some customers have reported issues with the magnetic filters and the window being tinted.

    "...It's an interesting design because there are holes all over the top, all over the bottom, and all over the front and you can install 4 fans if you..." Read more

    "...Well painted, no sharp edges, easily accommodates full size ATX PSU's but smaller ones are inexpensive and still efficient...." Read more

    "...I needed something compact and attractive, but that would have good airflow, sensible cable management options, and room for a standard sized video..." Read more

    "Very good solid case, I love the acryllic side panel (no tempered glass=no breaking very resillient)." Read more

    231 customers mention165 positive66 negative

    Customers like the size of the computer case. They say it fits everything needed easily, has a small footprint, and is a good size for a budget build. Some customers also mention that it fits a full ATX power supply and a big GPU.

    "Not sure why regular ATX systems still sell at all, this fits everything needed EASILY, in fact I wish it was a touch smaller if anything and this..." Read more

    "...I like how compact the case is and I was able to fit it under a small table...." Read more

    "...desktop case offers a blend of style, functionality, and space efficiency that caters to both seasoned enthusiasts and casual users...." Read more

    "...However, it is small. There is struggle to fit everything in there (though it will all fit), and the airflow really isn't the best, lading to temps..." Read more

    187 customers mention156 positive31 negative

    Customers like the ease of construction of the computer case. They mention that the SSD installing method is easy, wiring is easy and there is plenty of room to cram your cables out of. They also appreciate the easy cable management and the fact that it does not effect assembly of the PC. Customers also mention that it's easy to attach additional fans and reattach them.

    "...Overall the case was pretty simple to build in. It’s designed very well to maximize airflow while looking great...." Read more

    "...Pretty thick case I like it, very simple, short, and roomy for the little things I had no problems so far with service and shipping came right on..." Read more

    "...Both doors use thumbscrews, making access to the back super easy for cable routing..." Read more

    "...included screws, mounts, zipties, and fan is perfect and the Manual is straight forwardOverall I love this case despite some flaws." Read more

    179 customers mention153 positive26 negative

    Customers like the space in the computer chassis. For example, they mention it has plenty of room to cram their cables out of view, has a lot of airflow, and has room for case fans and larger GPUs and PSUs. They also appreciate the layout and cable management. Overall, most are happy with the space and functionality of the product.

    "...The case overall is pretty sturdy. The wires were organized and the case is also advertised as shown in here in my hands, it’s got labels for the..." Read more

    "...Pros:- Overall this was a joy to build in. Lots of spots for cable tie downs (several zip ties are included), passthroughs with clean, rolled..." Read more

    "...Thermals are excellent and have no complaints. I like the layout and cable management. Options for tower or vertical placement is really nice...." Read more

    "Compact, however it fits my components nicely. Especially for the price, it's really a very decent case.However, it is small...." Read more

    494 customers mention337 positive157 negative

    Customers have mixed opinions about the quality of the computer chassis. Some mention that it's a very good solid case, while others say that it feels a bit cheap and the preinstalled fan is subpar.

    "...Tons of places to put fans, hide excess PSU cabling when the seller of the PSU lies about it being semi-modular, very solid quality and flexibility..." Read more

    "...The case overall is pretty sturdy...." Read more

    "...The acrylic door is nicely tinted and seems sturdy; they’ve even installed little rubber grommets to prevent the thumbscrews from scratching the..." Read more

    "...way the psu sits recessed into the case from the back, and the flimsiness of the case...." Read more

    165 customers mention105 positive60 negative

    Customers are mixed about the airflow of the computer chassis. Some mention that it has great airflow, while others say that it really isn't the best. They also say that the case is highly ventilated, so it may not even need extra fans.

    "...It’s designed very well to maximize airflow while looking great. I think this is an excellent case especially for the price...." Read more

    "...fit everything in there (though it will all fit), and the airflow really isn't the best, lading to temps I didn't like...." Read more

    "Very affordable case with lots of air flow and comes with a built in fan. Very good value for the money and doesn't look bad by any means...." Read more

    "AIRFLOW: The airflow in this case is superb, and it has versatile fan support and placement for both 120 and 140mm fans, especially for how compact..." Read more

    128 customers mention78 positive50 negative

    Customers are mixed about the magnetic filters. Some like the filters, saying they look good and are washable. Others however, say that the magnets are incredibly weak and can slip if your grip isn't solid.

    "...I was pleasantly surprised to see that the filter is magnetic which made removing them to install my fans a breeze (pun intended)...." Read more

    "...The magnets are weak so any slight bump makes them slide, or when moving the case around, take them off!..." Read more

    "...solid quality and flexibility for the money and the washable magnetic dust filter covers are an awesome touch!..." Read more

    "...The dust filters are magnetic but if they're bumped they come off very easy." Read more

    Product is recommended and very simple
    5 Stars
    Product is recommended and very simple
    Overall, the product is amazing. The only bad flaw is it has a cheap exhaust fan and I don’t really care about that it’s a good spare part because I already had fans with me but that’s not the case. The case overall is pretty sturdy. The wires were organized and the case is also advertised as shown in here in my hands, it’s got labels for the micro ATX and mini ATX. I seen a bunch of bad reviews for the motherboard problems with motherboards for not fitting in probably because they didn’t buy the right one to fit in this case. dust filters are great and room for power supply significant. I highly recommend this product if your on a budget and also the glass scratches easily so beware of that if you don’t want your transparent screen or whatever scratched. Pretty thick case I like it, very simple, short, and roomy for the little things I had no problems so far with service and shipping came right on time and I personally think this is a good product
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    Top reviews from the United States

    Reviewed in the United States on June 25, 2020
    30 people found this helpful
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    Reviewed in the United States on December 27, 2019
    9 people found this helpful
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    Top reviews from other countries

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    Philippe
    5.0 out of 5 stars Fantastic Micro-ATX case, good on the wallet
    Reviewed in Canada on April 20, 2023
    One person found this helpful
    Report
    Amazon Customer
    5.0 out of 5 stars Excelente gabinete compacto a bajo costo.
    Reviewed in Mexico on August 28, 2021
    Fluffy
    5.0 out of 5 stars J'adore ce boitier.
    Reviewed in France on October 23, 2023
    2 people found this helpful
    Report
    Didwaf
    4.0 out of 5 stars bon boitier basique
    Reviewed in Belgium on April 30, 2023
    Daniël
    5.0 out of 5 stars Echte aanrader
    Reviewed in the Netherlands on September 7, 2021