For those who appreciate the finer things, such as the Alien Swarm Parasite cosmetic from TF2

This is a fan club dedicated to the Alien Swarm Parasite cosmetic in TF2, a multiplayer first-person shooter video game developed and published by Valve (2007). And to the host game Alien Swarm, a multiplayer top-down shooter video game developed by Valve (2010).

The Alien Swarm Parasite is a promotional cosmetic item for all classes. It is a stylized version of an enemy parasite from the game Alien Swarm. The creature attaches to each class's head differently, and sports a limp tail.

This item is awarded to players who complete Alien Swarm achievement Hat Trick by completing two co-op missions online, regardless of difficulty setting.

When players equipped with this item kill an enemy unassisted by another player, the killfeed shows everyone in Pyroland that it gets the assist, with its custom name if it has one.

The Wiki
The Backpack.tf Profile[backpack.tf]