The inside of the In Win Mana 137 is bare, which is why the case is so light. Towards the front of the case are the three 5.25” drive bays with tool-free latching system.
Further down are the six internal 3.5” drive bays, with their own tool-free installation system, which we will cover later on. On the bottom of the case there are two spots for 2.5” drives.
Towards the back of the case is the PSU cutout slot with raised bars to give the PSU some airflow. Moving up the rear of the case are the seven expansion slots with slotted covers and 120mm exhaust fan.
The motherboard tray has a CPU cooler cutout, as well as raised standoffs and a half pipe to help hide and route the cables behind the motherboard tray.
The opposing side of the case shows just how barebones this case is.