There are two types of packs available on the site:
This pack includes core character traits, bunker information, and catastrophe details. It is a complete pack with a lot of content and is used by default in any game.
Follow the main game rules when using the base packs.
These packs are only available for paid subscriptions (more information about them can be found here). They contain incomplete character traits, catastrophe descriptions, and bunker information. Some packs may include only certain character traits, others may only include professions without professional abilities, and some may only have bunker information. Generally, additional packs are used as unique additions to one of the basic packs (standard by default).
Roleplaying, professional abilities, special abilities, and other traits may differ from the standard game rules to add variety.