Backpack Cannon

The Ammunition Backpack is cool and all, but having to lug both it and your gun may be a hassle. Why not combine them both and get yourself a Backpack Cannon! Yeah, it would probably be really hard to aim, but come on.

Compare Shoulder Cannon, Weaponized Animal, Jet Pack, and Weaponized Exhaust.

Examples:

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    Anime and Manga 
  • General Catton in Samurai Pizza Cats had a double backpack cannon.
  • The Gundam franchise has many examples from pretty much every universe.
    • The most iconic examples would be the Guncannon and Guntank from the original series.
      • The RX-78-01 from Gundam: The Origin had a backpack-mounted cannon and one beam sword rack, instead of the traditional pair of saber racks. The RX-78-02, Amuro's Gundam, could have one of the racks replaced by a similar cannon. And of course, this also applies to the Origin versions of the Guncannon and Guntank.
    • The GM Cannon II and Xamel from Mobile Suit Gundam 0083: Stardust Memory. With the Xamel, the weapon's side actually makes it easy to mistake it for a Shoulder Cannon.
    • The Zaku Cannon, introduced in Mobile Suit Variations, was found to be unstable due to its backpack being too heavy and the recoil being too great, though some units were later used by the Earth Federation in Mobile Suit Zeta Gundam, and by Zeon remnants years later in Gundam Unicorn.
    • The OZ-07MS Tragos from Mobile Suit Gundam Wing featured a backpack cannon and a hoverskirt that made it resemble the original Guntank, although both could be detached to allow the Tragos to function as a conventional mobile suit as well. The manga adaptation of the series gave a similar cannon pack to Heavyarms.
    • After War Gundam X: The titular Gundam features the backpack-mounted Satellite Cannon system. Its Mid-Season Upgrade, the DoubleX, naturally has twin cannons.
    • The Doppelhorn Striker Pack from Mobile Suit Gundam SEED Destiny is basically this. It isn't seen too often, but can be attached to any Striker-capable Mobile Suit (such as the standard-issue 105-Dagger). The Integrated Weapons Striker Pack from SEED-MSV line has this amongst its many weapons.
    • Fumina's Powered GM Cardigan from Gundam Build Fighters Try can swap between beam cannons and Gatling guns, though the latter never appear in the anime itself, only in the model kit and video games.
  • The Lancelot Conquista's main weapon is the large Hadron Blaster on it's back that folds forward and docks with the VARIS rifle in order to fire. And it's so freaking powerful that nothing except the Guren SEITEN's upgraded radiant wave surger can stop it.
  • The eponymous Dougram of Fang of the Sun Dougram has a gigantic linear cannon mounted on its back—to fire it, it's pulled down over its left shoulder.

    Comic Books 
  • In Transformers: Last Stand of the Wreckers, Ironfist's lightformer cannon is his backpack... but he has to take it off to use it.
    • The tank mode turret of Ironfist's teammate Guzzle is situated on his back when in robot mode, with the barrel extending far past his head.

    Film - Live Action 

     Literature 

    Tabletop Games 
  • Shadowrun. The Ballista Multi-Role Missile Launcher, which is worn as a backpack.
  • Battlelords of the 23rd Century. The Cizerack (large quadrupedal catlike aliens) have been known to wear weapon systems mounted on their backs. See a picture here.
  • Likewise Battle Cattle (pic here).
  • Most of the power armor in Rifts has this, notably the Glitterboy and its variant armor.
  • In Warhammer 40,000, the Tyranid Biovore is a living Backpack Cannon.
    • Tau battlesuit jetpacks have mounting points for either support systems or weapons, with missile launchers most commonly shown in GW's in-house models fitted to the jetpack. The old Broadside models had the best demonstration of this in the franchise; their backpacks were fitted with a pair of railguns, which are at least twice as long as a man is tall - one on each shoulder.
  • A handful of BattleTech Battlemechs have this with rear-firing weapons, some being literal backpacks that fire into the rear arc. The more typical 'mounted on the back but firing forward' variety is actually rarer, with the Shadow Hawk being the most well known, as it is based on the Dougram mentioned above.

    Toys 
  • BIONICLE: the Toa Hordika's Rhotuka Spinners.

    Video Games 
  • Mario's F.L.U.D.D. in Super Mario Sunshine
  • The Buster Pod from Custom Robo Arena, which was just a cannon mounted on your robo's back.
  • Pokémon Black and White: Genesect, a Pokémon with a mounted cannon on its back, as modified by Team Plasma.
  • Carol from Wild ARMs 5 uses a backpack-mounted missile launcher. She can't use it without falling on her ass, but it does pack quite a punch.
  • The Taraba ninja from Shinobido use these as weapons. Yup, cannons, right...
  • Shadow from Mega Man X: Command Mission has a "Pulverizer Cannon" on his back. It takes three turns to charge, and like its name suggests, it hurts a lot on all your characters.
  • The Dwarf from Sacred has this as a special weapon.
  • In StarCraft II, the Thor superheavy siege walker and its Super Prototype Odin both feature a set of four backpack-style guns, described as 330mm high-ex cannon (you could fire a smallish person out of a gun like that). While they are used for single salvoes rather than being an alternate mode shift like the Siege Tank, the mech still has to hunch back and take up a firing stance, rendering it briefly immobile while the weapons are being fired. The results are usually worth the hassle.
  • Game Mods for Tribes usually add at least one of these. Instead of carrying around a regular backpack, like a shield pack, you can stick a big gun on your shoulder, allowing you to use both your hand weapon and the backpack weapon at the same time.
  • The Duke Nukem 3D boss "Overlord" has a back-mounted rocket launcher.
  • Seeing as the class is a straight-up expy of Boba/Jango Fett, Bounty Hunters in Star Wars: The Old Republic have an attack or two that launches rockets out of their jetpack.
  • In Kaiju Combat, the S.C.U.D. attached to the kaiju Katyusha is one that can twist around and serve as a jetpack.
  • In Dark Void, your jetpack has guns in it. Sort of justified in that they only get used in flight mode when they can be aimed.
  • Samurai Warriors: Ishikowa Goemon has an actual cannon strapped to his back that he uses in various combo attacks as well as his Musou attack. In the first game he could also use it to blast open certain walls on some levels, revealing hidden loot or shortcuts.