The Cooler Master Cosmos S is one of the most spacious I've ever had the pleasure of personally inspecting. Most of my cases have been mid-ATX or smaller, as I'm a LAN party guy who likes compact, yet functional cases such as Cooler Master's Ammo 533 from a few years ago. The expanse within the Cosmos S is a breath of fresh air for me, and for my primary machine.
The side panel 200 mm fan is quite large-most cases don't have or need fans this big. However, Cooler Master decided to sacrifice silence for performance with the Cosmos S, so every fan is needed.
At the bottom of the case are two filtered fan ports. One is obviously for the power supply's fan. The filter is internal and within a set of rails. The other is for a bottom fan, and its filter is external.
The expansion bays are covered with solid covers, an odd choice considering most other surfaces are mesh. I'll be changing that-watch the Installation section for more on that. A 120 mm fan handle exhaust for the main chamber.
There's a mess of cables hanging from the top of the case. All are for the front panel, including a 24-pin vampire connector to power the lights and power button.
The hard drive cage hangs out on the lower end of the drive bay area. It has an intake fan on the front of it. The drives are held in using a snapping...holder. It's pretty neat.