One of Research Institute 7's masterpieces, developed as a continuation of the KZK series, retaining the idea of combining compactness and volume.\nLike the Berloga-6U, KZK-4 was equipped with a modified component based on sample No. 3-EA, which improved the container's efficiency.\nStalkers, not thinking long, decided to give the institute's development a name consistent with other containers in the series.