The Antec ISK300-150 has a the Mini-ITX form factor. Mini-ITX is even smaller than Micro-ATX, allowing PC builders the opportunity to create a low-performance, but discreet and low-power system. Using the Mini-ITX standard, the case can house motherboards and power supplies with form factors Array. The dimensions of the case itself (LxWxH) are 328mm x 222mm x 96mm.

The case has one 5.25" drive bays, which is enough room for an optical drive but little else, and with no 3.5" drive bays, that is a bit worrying for anyone that doesn't want to choose between having one optical drive or one hard drive. With two 2.5" bays, however, there is enough room for a laptop-sized HDD or solid-state drive.

Made primarily of Steel, the Antec ISK300-150 is built to be strong and well-ventilated. Steel cases are generally fairly cheap and sturdy, but also tend to be quite heavy. Whatever your case's material, it is important to keep a consistent airflow so that heat doesn't build up inside. It is therefore advised that you make use of the available built-in case fans and fan installation sections.