Holiday Shipping Details & Extended Holiday Returns 
Choose Your Style
The MasterBox Q300P is your portable 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.
System Flexibility
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.
Easy Handling
Four removable handles make it easy to transport your full system build to a LAN Party and elsewhere.
Small Form Factor, ATX PSU Support
Despite the Micro-ATX form factor and the body depth/height of only 370 x 370mm, the MasterBox Q300P can accommodate a normal ATX PSU.
Edge-to-Edge Acrylic Side Panel
Show off your build through the full size transparent side panel.
RGB LED Fans
Two pre-installed 120mm RGB LED fans behind the front panel and RGB lighting at the top front can create an amazing lighting effect.
Routing Space
A space 28mm-wide behind the motherboard tray offers open space for hidden cable management.
RGB Lighting Control, Out of the Box
One RGB controller is included with the Q300P. If your MB does not support the RGB control function, you can connect the RESET button cable and control the RGB lighting directly from the I/O panel.
1-to-3 Splitter Cable for RGB Fans
The RGB Connector Splitter and 4 pin male to male adapters are included. Certified compatible with ASUS, Gigabyte, MSI, and ASRock motherboards.
Compare
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| Q300P | Q300L | ||
| Product Number | MCB-Q300P-KANN-S02 | MCB-Q300L-KANN-S00 | |
| Available Color | Black | Black | |
| Materials | Steel, Plastic | Steel, Plastic | |
| Dimensions, L x W x H | 450 x 230 x 450mm | 387 x 230 x 378mm | |
| Motherboard Suport | Micro-ATX, Mini-ITX | Micro-ATX, Mini-ITX | |
| Expansion Slots | 4 | 4 | |
| Drive Bays | 5.25" | 0 | 0 |
| 3.5" HDD | 1 | 1 | |
| 2.5" SSD | 2 | 2 | |
| I/O Port | USB 3.0 x 2, Audio In/Out | USB 3.0 x 2, Audio In/Out | |
| Pre-Installed Fan(s) | Front | 120mm RGB LED x2 | n/a |
| Rear | 120mm x1 | 120mm non-LED x1 | |
| Fan Support | Front | 120 / 140mm x2 | 120 / 140mm x2 |
| Top | 120mm x2 | 120mm x2 | |
| Rear | 120mm x1 | 120mm x1 | |
| Bottom | 120mm x1 | 120mm x1 | |
| RGB Controller | Included | Included | |
| Radiator Support | Front | 120mm x1 / 240mm x1 | 120mm x1 / 240mm x1 |
| Rear | 120mm x1 | 120mm x1 | |
| Clearances | CPU Cooler | 157mm | 157mm |
| PSU | 160mm | 160mm | |
| GPU | 360mm | 360mm | |
| Cable Routing | Behind MB Tray | 28mm | 28mm |
| Dust Filters | Bottom | Bottom | |
| Power Supply Support | Bottom Mount, ATX PS2 | Bottom Mount, ATX PS2 | |
| EAN Code | 4719512065518 | 4719512065488 | |
| UPC Code | 884102038037 | 884102038006 | |
| Net Weight | 5.2 kg | 3.7 kg | |
| Gross Weight | 6.4 kg | 4.7 kg | |
| Carton Dimensions, L x W x H | 510 x 277 x 527mm | 435 x 276 x 461mm | |