--- product_id: 59059637 title: "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" brand: "cooler master" price: "₱23925" currency: PHP in_stock: true reviews_count: 13 category: "Cooler Master" url: https://www.desertcart.ph/products/59059637-cooler-master-masterbox-q300l-micro-atx-pc-case-compact-matx store_origin: PH region: Philippines --- # Magnetic dust filters with unique pattern Perforated airflow + 1x120mm fan pre-installed Supports Micro-ATX & Mini-ITX boards 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 **Brand:** cooler master **Price:** ₱23925 **Availability:** ✅ In Stock ## Summary > 🖤 Small size, big impact — the MasterBox Q300L is your sleek, customizable PC case for next-level builds! ## Quick Answers - **What is this?** 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 by cooler master - **How much does it cost?** ₱23925 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/59059637-cooler-master-masterbox-q300l-micro-atx-pc-case-compact-matx) ## Best For - cooler master enthusiasts ## Why This Product - Trusted cooler master brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact Powerhouse:** Fits high-end GPUs up to 360mm & CPU coolers up to 159mm without compromise - • **Modular I/O Freedom:** Adjust I/O panel to 6 positions for ultimate desk setup flexibility - • **Showcase Your Build:** Edge-to-edge transparent side panel to flaunt your meticulous rig - • **Customizable Cooling:** Supports up to 5 fans & 240mm liquid cooling for elite thermal performance - • **Dust-Free & Distinctive:** Magnetic dust filters with a standout pattern keep your system clean and stylish ## Overview The Cooler Master MasterBox Q300L is a compact Micro-ATX PC case designed for professionals who demand modularity and superior airflow in a small footprint. It supports Micro-ATX and Mini-ITX motherboards, accommodates large GPUs and CPU coolers, and features a perforated design with magnetic dust filters for optimal cooling and cleanliness. Its adjustable I/O panel and transparent side panel offer flexible setup and a premium showcase for your build, making it perfect for both office and home environments. ## 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. Review: Elite for the price! - Considering the price point, this is the best case I've ever used. Sure it isn't the best case in existence but nothing at this price beats it. Cable management is decent, it has felt plenty sturdy to trust with my components and has more space for fans than my motherboard does headers. Cooling is only limited by my issues with limited fan headers, not the case. Fit my 9070 XT no problems as well and the tower air cooler. ONly issues I've had are the weak magnets on the dust filters, and a few sharp edges that I ran into during install. Also only 2 hard drive mounts isn't ideal but hasn't been a problem. Review: Very Good Budget PC Case - Bought this pc case for my friends budget pc with a ryzen 5 5500 and an rx 7600 and it looks beautiful. Some thing though. 1. Cable management is harder. There is limited space in the back so cable management is hard, but this is true for many cases. Not crazy hard but there isn’t a ton of room 2. Make sure to take out the GPU brackets before installing the motherboard. We didn’t do it and almost broke the motherboard, that is our fault though. Overall a very good budget case and fits well in desk, I’d recommend a semi modular or modular psu so cables are everywhere. Also it’s micro atx, and the front supports dual 140mm fans. Overall very nice case. ## Features - Ample Interior: Explore ample interior space for Micro-ATX or Mini-ITX motherboards, ensuring easy and future expansion - Components Clearance: Accommodates CPU coolers with a max height of 159mm, GPU cards up to 360mm, and PSU up to 160mm in length. - Versatile Cooling: Maximize cooling performance with a 240mm liquid cooler and 5 fans. - Modular I/O Panel: You have the flexibility to adjust its position at the front, top, or bottom on both sides - Edge-To-Edge Panel: Show off your meticulous build through the transparent side panel with pride. - Open Thermal Design: The perforated design on all sides promotes optimal airflow and heat dissipation - Magnetic Dust Filters: The unique pattern of the dust filter adds a distinctive appearance to the case. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0785GRMPG | | Antenna Location | Gaming | | Best Sellers Rank | #9 in Computer Cases | | Brand | Cooler Master | | Built-In Media | 1 computer case | | Case Type | Mini-Tower | | Color | Black | | Compatible Devices | Micro-ATX and Mini-ITX motherboards, Cooler Master devices | | Cooling Method | Air | | Customer Reviews | 4.5 out of 5 stars 13,900 Reviews | | Enclosure Material | Alloy Steel, Plastic | | Global Trade Identification Number | 00884102038006, 00884102095313, 04719512065488 | | Hard Disk Form Factor | 3.5 Inches | | Internal Bays Quantity | 1 | | Item Dimensions D x W x H | 15.39"D x 9.06"W x 15"H | | Item Type Name | grocery | | Item Weight | 480 Grams | | Manufacturer | Cooler Master | | Material | Alloy Steel, Plastic | | Mfr Part Number | MCB-Q300L-KANN-S00 | | Model Name | Q300L | | Model Number | MCB-Q300L-KANN-S00 | | Motherboard Compatability | Micro-ATX and Mini-ITX | | Number of Fans | 3 | | Other Special Features of the Product | Accomodates CPU Coolers, Adjustable, Dust Filter, Edge-To-Edge Panel, Fully Ventilated | | Power Supply Maximum Output | 500 Watts | | Power Supply Mounting Type | Bottom Mount | | Recommended Uses For Product | Gaming | | Supported Motherboard | Micro-ATX and Mini-ITX | | Total Expansion Slots Quantity | 4 | | Total USB 3.0 Ports | 2 | | Total Usb Ports | 2 | | UPC | 884102095313 884102038006 | | Warranty Description | 2 | ## Product Details - **Brand:** Cooler Master - **Case Type:** Mini-Tower - **Color:** Black - **Cooling Method:** Air - **Item Weight:** 480 Grams - **Material:** Alloy Steel, Plastic - **Model Name:** Q300L - **Motherboard Compatability:** Micro-ATX and Mini-ITX - **Power Supply Mounting Type:** Bottom Mount - **Recommended Uses For Product:** Gaming ## Images ![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 - Image 1](https://m.media-amazon.com/images/I/91UOdM9izhL.jpg) ![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 - Image 2](https://m.media-amazon.com/images/I/81KohRhMOZL.jpg) ![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 - Image 3](https://m.media-amazon.com/images/I/81+rpaxzoYL.jpg) ![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 - Image 4](https://m.media-amazon.com/images/I/718+isi0SoL.jpg) ![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 - Image 5](https://m.media-amazon.com/images/I/811RcaP29JL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Is this case wide enough to support a cooler master hyper 212 evo?** A: I know what the official CM specs are, but I think it will fit. This guy installed a taller cooler with its cover and it fit. https://www.vortez.net/articles_pages/cooler_master_masterbox_q300l_review,8.html **Q: I've seen photos of the handle (from a Q300P) being attached to the center of the top panel of this case. Is this possible?** A: You can remove the plastic bit that has the cooler master logo on it and install handles on the case like the Q300P **Q: what are the size and placements of the fans?** A: There are 3 fans (120mm) in total. 1 exhaust fan in the rear, and 2 intake fans at the front. -CM Myke **Q: Does the case come pre-assembled?** A: Hello Kevin, The case does come assembled, but you will need to plug in the connectors, and open it up to install your components. CM-PNguyen ## Customer Reviews ### ⭐⭐⭐⭐⭐ Elite for the price! *by S***N on March 4, 2026* Considering the price point, this is the best case I've ever used. Sure it isn't the best case in existence but nothing at this price beats it. Cable management is decent, it has felt plenty sturdy to trust with my components and has more space for fans than my motherboard does headers. Cooling is only limited by my issues with limited fan headers, not the case. Fit my 9070 XT no problems as well and the tower air cooler. ONly issues I've had are the weak magnets on the dust filters, and a few sharp edges that I ran into during install. Also only 2 hard drive mounts isn't ideal but hasn't been a problem. ### ⭐⭐⭐⭐⭐ Very Good Budget PC Case *by J***I on March 6, 2026* Bought this pc case for my friends budget pc with a ryzen 5 5500 and an rx 7600 and it looks beautiful. Some thing though. 1. Cable management is harder. There is limited space in the back so cable management is hard, but this is true for many cases. Not crazy hard but there isn’t a ton of room 2. Make sure to take out the GPU brackets before installing the motherboard. We didn’t do it and almost broke the motherboard, that is our fault though. Overall a very good budget case and fits well in desk, I’d recommend a semi modular or modular psu so cables are everywhere. Also it’s micro atx, and the front supports dual 140mm fans. Overall very nice case. ### ⭐⭐⭐⭐ Pretty, but do NOT buy this for your first build *by A***X on July 14, 2019* I love this case. I hate this case. Such wonderful and hateful things to say about the same case. Lets review. The good: This case is pretty. I love the aesthetics of this case. It's also very compact. It looks like a midget compared to my old Coolermaster HAF 900 series case. That's nice, since I get a lot more room on my desk, and I can position this tower in places I couldn't fit my old one. It's allowed me to do some really cool things with my desk setup that I couldn't do before. The dust covers are pretty, and they make it much easier to clean the case more frequently. (You'll still need deep cleaning every once and a while.) The bad: Boy oh boy does it suck to install things in this case. Like, cable routing is a FREAKING NIGHTMARE. If you don't care about that stuff, then it's still going to suck working in this case. "Cheap crap" is a nice description of everything about this case. The window? Cheap plexiglass that scratches easily. The PCI-E holes at the back of the case require you to pull them off using excessive force, potentially risking bending the thin metal between the slots. I ended up bending the back PCI-E screw pannel by overtightening the screws. Airflow? Gamer's Nexus tested the Q500L version of the case, and it was literally the worst case they ever tested for air flow. It caused components to thermal throttle (read: slow your computer down) at even low workloads. The Q300L is better, but it's still not winning any competitions. NEVER buy the Q500L. That seems like a long list of negatives, and it is. But I haven't gotten to the worst sin this case commits: Cable routing. I'm sure this is better than some other cases out there, but it's still pretty bad. Let's enumerate the problems you'll likely run into when routing cables: The movable button panel doesn't stretch long enough to route in convenient locations. The only place to run cables to the top of the case is a small hole that doesn't fit a standard power connector without causing you crazy amounts of grief and bending the plastic connectors while tearing chunks of flesh off your finger as you pull it through. There's not enough room on the back of the case to run your standard SATA cables for SSDs, and installing front fans means you lose out on a lot of potential cabling options. (You HAVE to move the button panel to the bottom/top if you use front fans) Why did I get this? I couldn't find a reasonably priced small sized case to put a Threadripper build in. I could have sprung for one of the smaller cases designed for compact builds, but each one of them had a deal-breaking problem. (Out of stock, couldn't fit micro-atx mobo, costs like 400$, etc.) I knew what I'd suffer through to get all the hardware to fit inside this case, while running custom cables for aesthetics. I consider it a worthwhile purchase. I spent several extra hours building this when compared with a case that was well designed. I ran into like 20 different configurations where things barely didn't fit by a millimeter or less, and the current configuration fits because I spent like 3 extra hours cabling this monster. But it was cheap, pretty, and small, so I'd probably do it again. Probably not the right case for you. Overall: This is a cheap case. It's an affordable place to put your computer. Don't expect much more than that. You can spend like 20$ more to get something truly worth holding your components. ## Frequently Bought Together - 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) - AMD Ryzen 5 5500 6-Core, 12-Thread Unlocked Desktop Processor with Wraith Stealth Cooler - Thermaltake Smart 500W 80+ White Certified PSU, Continuous Power with 120mm Ultra Quiet Cooling Fan, ATX 12V V2.3/EPS 12V Active PFC Power Supply PS-SPD-0500NPCWUS-W --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ph/products/59059637-cooler-master-masterbox-q300l-micro-atx-pc-case-compact-matx](https://www.desertcart.ph/products/59059637-cooler-master-masterbox-q300l-micro-atx-pc-case-compact-matx) --- *Product available on Desertcart Philippines* *Store origin: PH* *Last updated: 2026-05-08*