Backpack



The backpack is a powerup that doubles the player's ammo-carrying capacity. After picking up a backpack, the player is able to carry up to 400 bullets, 100 shotgun shells, 100 rockets, and 600 plasma cells at once. The backpack also gives 10 bullets, 4 shotgun shells, 1 rocket, and 20 cells when picked up (20, 8, 2 and 40 on I'm Too Young To Die and Nightmare!).

If the player picks up a subsequent backpack, he only receives the extra ammunition.

The backpack's effect lasts until the end of the episode in Doom and until the end of the game in Doom II/Final Doom.

Using IDKFA or IDFA to give the player all weapons and maximum ammunition does not give the player a backpack. The backpack is the only power-up tool which does not have a corresponding IDBEHOLD code.

Appearance statistics
The IWADs contain the following numbers of backpacks: