In Counter-Strike 2 may appear keychains. This was reported by insider Maxim Poletaev in a video on his YouTube channel.

This is indicated by the large number of mentions of the word keychain in the game code after the recent update. The option to preview them in the protobuff [a file that collects relevant information happening in the game and sends it to the server] has also appeared. “The keychains hang on specific weapons, most likely only firearms,” Gabe Follower noted. The insider explained that the developers will put the keychains in capsules and they will have a separate rarity. He also added that there may be an option for players to create keychains on their own.