Designed for builders who want to optimize every centimeter, the Cooler Master MasterBox Q300L is a steel and plastic Mini-tower case compatible with Micro-ATX and Mini-ITX. Its compact format (387 × 230 × 378 mm, 3.7 kg) doesn't hinder its ambitions: it accommodates GPUs up to 360 mm, CPU coolers up to 159 mm, and offers 4 PCI slots for a powerful setup. Thermal management is considered from the start with a pre-installed 120 mm fan at the rear and spaces for up to 5 additional fans. The transparent side panel reveals the build, while the two front-facing USB 3.0 ports and audio jack remain accessible for daily use. A simple and well-sized case for building a compact PC without compromise.