K39 is sub 5L Mini-ITX case. The 4L K39 v2 was discontinued and replaced by 5.2L K39 v3. Version 3 is only available in white. K39 v3 is still one of the best SFF cases in the 5L category due to its entry price and hardware compatibility.
DAN C4 SFX v2
The Dan C4-SFX v2 will be 13.88L in volume and will support only Mini-ITX motherboards, has support for 280mm liquid coolers, 145mm air coolers and 3.7 slot full length graphics cards.