ARC Raider's early beta was an excellent opportunity for the players to try out the game for free, and also get the Server Slam backpack for free in the process.
In case you didn't participate in it, the Server Slam event was held in the middle of October. While not all the content might have been made available to the players, you have to clear a fair amount of content. The Server Slam backpack is a token of gratitude from the developers, and you can use it in the full game now that it's out globally.
