They offer longer runtimes or multiple "best" scenes for a lower price than buying individual volumes.
In the world of Japanese adult media, production labels like use these codes to categorize their massive libraries. The "SSIS" prefix belongs to this major studio, known for high production values and featuring some of the industry's top "exclusive" actresses. ssis453 taller older sister looks down on m repack
Repacks are often released for digital streaming platforms long after the physical DVD has gone out of print. They offer longer runtimes or multiple "best" scenes