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header-product PC case Cooler Master MasterBox Q300L Midi Tower Black
46.49 €

PC case Cooler Master MasterBox Q300L Midi Tower Black

PC case Cooler Master MasterBox Q300L Photo 1
PC case Cooler Master MasterBox Q300L Photo 2
PC case Cooler Master MasterBox Q300L Photo 3
PC case Cooler Master MasterBox Q300L Photo 4
PC case Cooler Master MasterBox Q300L Photo 5
PC case Cooler Master MasterBox Q300L Photo 6
PC case Cooler Master MasterBox Q300L Photo 1
PC case Cooler Master MasterBox Q300L Photo 2
PC case Cooler Master MasterBox Q300L Photo 3
PC case Cooler Master MasterBox Q300L Photo 4
PC case Cooler Master MasterBox Q300L Photo 5
PC case Cooler Master MasterBox Q300L Photo 6
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Short description

The Cooler Master MasterBox Q300L is a Midi Tower PC case designed for optimal airflow and cooling. It features a bottom-mounted power supply, supports ATX and PS2 power supply form factors, and accommodates front fans with diameters of 120 and 140 mm. The case comes with one pre-installed 120 mm rear fan and supports HDD sizes of 2.5" and 3.5". With dimensions of 230 mm width, 387 mm depth, and 378 mm height, it offers a compact yet spacious design for your components.
Available at price 46.49 €: 100 pcs.
Total available for order: 162 pcs.
Warranty: 2 Years
SKU: 562027
free shipment

Cheapest delivery:

Venipak Pickup LV, Venipak Locker LV

Pick-up points

Venipak Pickup LV

Venipak Locker LV

Cost

1.89 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
13.07.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
16.07.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 4.49 kg)
Parcel couriers
Venipak Pickup LV / Venipak Locker LV / Latvijas Pasts pakomāts / Unisend LV / DPD Paku skapis / Omniva LV / Latvijas Pasts nodaļa
16.07.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.89 €
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Payment Methods:
Bank transfer, Bank cards on-line, Apple Pay, Google Pay
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Product information

Description

The Cooler Master MasterBox Q300L is a compact Midi Tower PC case designed to combine modular layout and effective airflow in a small footprint. Its cube-inspired frame includes a removable magnetic dust filter with a distinctive pattern and an adjustable I/O panel that can be positioned in six locations to match different system orientations. Despite the compact size, the case supports a standard ATX power supply and is supplied with one 120 mm rear fan, offering practical compatibility for office or home builds.

Advantages

The MasterBox Q300L provides flexible I/O placement, support for an ATX PSU in a compact chassis, and a ventilated design with a pre-installed 120 mm rear fan to improve cooling. The magnetic dust filter with a special pattern is easy to remove and clean, and the chassis accepts both 2.5" and 3.5" drives while maintaining a small external footprint.

Suitable for

  • Compact home or office PC builds
  • Micro ATX or Mini-ITX motherboards
  • Systems requiring a standard ATX power supply in a small case
  • Setups prioritizing easy maintenance and airflow

Key specifications

  • Type: PC case, Midi Tower
  • Supported motherboard form factors: Micro ATX, Mini-ITX
  • Dimensions (W×D×H): 230 × 387 × 378 mm
  • Weight: 3.7 kg
  • Drive bays: 1 × 3.5", 2 × 2.5"
  • Pre-installed fans: 1 × 120 mm (rear)
  • Front fan support: 120 mm, 140 mm
  • Power supply: supports standard ATX PSUs (bottom-mounted); PSU not included
  • Front I/O: 2 × USB 3.2 Gen 1 Type-A
  • Side window: Yes
  • Material: Steel, Plastic
  • Colour: Black

How to use

Install a Micro ATX or Mini-ITX motherboard and route cables to the rear and bottom channels to maintain airflow. Fit the ATX power supply in the bottom compartment and secure 3.5" and 2.5" drives in the provided bays. Place additional 120 mm or 140 mm fans in supported front positions if extra intake is needed. Adjust the I/O panel to one of the six available positions to suit your desk or case orientation, and attach the magnetic dust filters as required.

Usage recommendations

For best thermal performance, use at least one front intake fan (120 mm or 140 mm) paired with the included 120 mm rear exhaust. Regularly clean the magnetic dust filter to maintain airflow and ensure components remain dust-free.

Specifications

Type:
PC
Form factor:
Midi Tower
Number of 3.5" bays:
1
Number of 2.5" bays:
2
Number of 5.25" bays:
0
Side window:
Yes
Power supply included:
No
USB 2.0 ports quantity:
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:
2
Weight:
3.7 kg
Supported motherboard form factors:
Micro ATX, Mini-ITX
Material:
Steel, Plastic
Product colour:
Black
All features

Design

Type:
PC
Form factor:
Midi Tower
Supported motherboard form factors:
Micro ATX, Mini-ITX
Number of 3.5" bays:
1
Number of 2.5" bays:
2
Number of 5.25" bays:
0
Side window:
Yes
Material:
Steel, Plastic
Product colour:
Black
Anti-dust filter:
Yes
Maximum CPU cooler height:
157 mm
Maximum graphics card length:
360 mm
Number of expansion slots:
4
Maximum PSU length:
160 mm
LED indicators:
Y
Cable management:
Yes

Power supply

Power supply included:
No
Power supply location:
Bottom
Supported power supply form factors:
ATX, PS2

Ports & interfaces

USB 2.0 ports quantity:
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:
2
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity:
0
Audio input:
Yes
Audio output:
Yes
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity:
0

Cooling

Cooling:
Yes
Number of front fans supported (max):
2
Front fans diameters supported:
140, 120
Rear fans diameters supported:
120
Top fans diameters supported:
120
Bottom fans diameters supported:
120
Number of rear fans supported (max):
1
Number of top fans supported (max):
2
Number of bottom fans supported (max):
1
Rear fans installed:
1x 120 mm
Liquid cooling capability:
Yes
Rear radiator sizes supported:
120
Front radiator sizes supported:
120, 240

Storage

Supported HDD sizes:
2.5, 3.5

Weight & dimensions

Weight:
3.7 kg
Height:
378 mm
Width:
230 mm
Depth:
387 mm

Packaging data

Package weight:
4700 g
Package depth:
435 mm
Package height:
461 mm
Package width:
276 mm

Logistics data

Harmonized System (HS) code:
84733080

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Stock data
Warehouse Stock Delivery to the store Store Price
WH115 100 13.07.2026 Best delivery 46.49 €
WH94 60 13.07.2026 Best delivery 47.99 €
WH337 2 13.07.2026 Best delivery 62.49 €
46.49 €
Stock: 100
Delivery Date: 13.07.2026 Best delivery
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47.99 €
Stock: 60
Delivery Date: 13.07.2026 Best delivery
Warehouse: WH94
62.49 €
Stock: 2
Delivery Date: 13.07.2026 Best delivery
Warehouse: WH337

Customer reviews

Customer questions

FAQ

How much does the PC case Cooler Master MasterBox Q300L cost, and is it available for purchase?

The price is 46.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 162 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All Cooler Master products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Cooler Master service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: type, form factor, number of 3.5" bays, number of 2.5" bays, number of 5.25" bays, side window, power supply included, usb 2.0 ports quantity, usb 3.2 gen 1 (3.1 gen 1) type-a ports quantity, weight, supported motherboard form factors, material, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

Where can I download the instructions for PC case Cooler Master MasterBox Q300L?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.
warranty
14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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