The bomber cap is one of two items of clothing that form the Bomber jacket costume, the other being the Bomber jacket. Players obtain the set after completing the Enlightened Journey quest.
Players can combine the Bomber cap with the Gnome goggles from the Gnome Restaurant minigame into a Cap and goggles by talking with Auguste on Entrana.
It can be used as warm clothing for the Wintertodt.
It can be stored in the armour case of the Costume Room in a player-owned house.