$89^.99

Free 15-day Returns

Limit 99999 per customer.

Sold by Aero Malls Inc.

Top Rated

4.7 (5,518 seller ratings)

Shipped by Aero Malls Inc.

Price alert

Add to Wish List

Best Sellers

Newegg

$69^.99
+ FREE SHIPPING

Meet Your Seller

Aero Malls Inc.

See Seller Store

Get Educated

Make informed decisions with expert advice. Learn More

More Resources

ATX Mid-Tower PC Cases

Computer Case Size Buying Guide

Main image of Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 2 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 3 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 4 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 5 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 6 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 7 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 8 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 9 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 10 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 11 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 12 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 13 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 14 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 15 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 16 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 17 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 18 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Alt view image 19 of 19 - Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

Customer images

Shop All Cooler Master Products | Visit Aero Malls Inc. Store

Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black

(537)(58) Write a Review

Options: MasterBox Q300L (Black)

MasterBox Q300L (Black)
MasterBox Q300LV2 (Black)

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

Overview

Specs

Reviews (537)

Patterned Magnetic Dustfilters Special pattern on the dust filter creates a unique outlook for the chassis. Modular I/O Panel The I/O panel can be adjusted to six different locations. On both side of the body you can install the I/O panel at the front, top or bottom. Multiple Positioning Options The case can be put in vertical or horizontal position. Edge-to-edge Side Panel Show off your build through the full size transparent side panel. Clean Routing Space Behind the motherboard tray, 28mm of space is offered for cable management. Performance The open design of the perforated front, top and bottom guarantees excellent thermal performance Fan and Radiator Support The front supports up to two 140mm fans and up to a 240mm radiator.

The rear supports a 120mm fan or radiator and the top two 120mm fans. All to ensure you don't have to compromise on performance

Best Seller Ranking	#80 in Computer Cases

Model
Brand	Cooler Master
Series	MasterBox Q300L
Part Number	MCB-Q300L-KANN-S00

Details
Type	Micro ATX Tower
Color	Black
Case Material	Steel / Plastic
With Power Supply	No
Power Supply Mounted	Bottom
Motherboard Compatibility	Micro ATX / Mini ITX
Side Panel	with Side Window
Dust Filters	Bottom

Expansion
Internal 3.5" Drive Bays	1
Internal 2.5" Drive Bays	2
Hot-Swap Drive Bays	0
Expansion Slots	4

Front Panel Ports
Front Ports	2 x USB 3.0, 2 x Audio

Cooling System
Fan Options	Front - 2 x 120mm / 2 x 140mm fan Rear: 1 x 120mm fan (Pre-installed) Top: 2 x 120mm fan Bottom: 1 x 120mm fan
Radiator Options	Front - Up to 240mm / Rear - Up to 120mm
80mm Fans	No
140mm Fans	No
Side Air duct	Yes

Dimensions & Weight
Max GPU Length	360 mm
Max CPU Cooler Height	157 mm
Max PSU Length	160 mm
Dimensions	15.00" x 9.06" x 15.24"
Weight	8.16 lbs.

Additional Info
Features	High Flexibility for System Building: The I/O panel can be adjusted to six different locations. On both side of the body you can install the I/O panel at the front, top or bottom. Minimized Dimension with ATX PSU Support: Despite the Micro-ATX form factor and the body depth and height of only 370mm x 370mm, the MasterBox Q300L can accommodate a normal ATX PSU. Patterned Dust Filter: Special pattern on the dust filter creates a unique outlook for the chassis. Clean Routing Space: Behind the motherboard tray, it offers 28mm wide and spacy room for hidden cable management. Excellent Thermal Performance: The open design of the perforated front, top and bottom guarantees excellent thermal performance. Edgo-to-Edge Acrylic Transparent Side Panel: Show off your build through the full size transparent side panel. Vertical and Horizontal position: The case can be put in vertical and horizontal position.

Additional Information
First Listed on Newegg	March 08, 2019

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Please contact the Seller directly for warranty information. Warranty information may also be found on the Manufacturer's website.
Read full details
CONTACT

Return Policies

Return for refund within: 15 days
Return for replacement within: 30 days
This item is covered by Aero Malls Inc. Return Policy

Manufacturer Contact Info

For a directory of all our manufacturers, please click below.
Manufacturers Directory

Item#: 9SIA9H57D99250