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[[caption-width-right:350:[[JustForPun It's hammer time]]!]]

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->''"From this bag here, why, I can pull most anything imag'nable\\
Like office desks and lava lights and Bert, who is a cannibal."''
-->-- '''Yakko Warner''', ''WesternAnimation/{{Animaniacs}}''
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Hammerspace is the notional place that things come from when they are needed, and where they go back to when not. The term was fan coined as the place cartoon characters and anime/manga characters would store the overly-large hammers and assorted weaponry they had a propensity for hitting each other with, especially for comedic effect.

The actual location of hammerspace is very hard to determine. There seems to be a great deal of it behind people's backs and on the opposite side ([[FourthWall from the camera]], that is) of [[BehindAStick thin things like lampposts and slender trees]]. It also hides in people's coats, closets, {{clown car}}s, large sacks, and occasionally [[TrouserSpace down their pants]].

Further research into the exact location of Hammerspace awaits solution of a few more basic questions. Such as: "What happens when you turn a BagOfHolding inside out?" and "Why is the inside of [[Series/DoctorWho the TARDIS]] only ''that'' [[BiggerOnTheInside much larger than its exterior]]?"

%comment% (Notice that, while we have discussed Hammerspace in great detail, we'll have to ''stop'' here, as we can't even ''touch'' Hammertime as a concept.)

It's also referred to as "hyperspace", but that term gets a little confused with the [[SpeculativeFiction SF]] term related to FasterThanLightTravel (see SubspaceOrHyperspace). Just to confuse things further, "subspace" is a word used in ''{{Franchise/Transformers}}'' fandom for Hammerspace. It is called "katanaspace" in ''Series/{{Highlander}}'' fandom, "back pockets" in the cartoon [[TabletopGames roleplaying game]] ''TabletopGame/{{Toon}}'', and referred to simply as "Elsewhere" in the FantasyKitchenSink roleplaying game ''TabletopGame/{{Exalted}}''.

There are multiple versions, in order of size:
# '''Basic Hammerspace''': This version contains only a few things, not because it is limited in capacity, but because that is all it is ever used for--for example a large weapon, or Optimus Prime's trailer. It is usually played for convenience, and most viewers give it a HandWave, although there is occasional lampshading.
# '''Game Hammerspace''': Used frequently in games--many of your inventory items are much too large or too heavy to be carried normally, and this is where they are stored until they are used. Game Hammerspace may or may not be infinite, depending on whether your inventory has a limited number of items, but it still holds many things without spoiling the lining of your coat.
# '''Infinite Hammerspace''': This version is played with a bent towards comedy. It can traditionally hold as much as the joke requires it to hold, may have multiple dimensions to its capacity (eg somebody looking in and finding one thing, closing the 'door' and looking in again to find something else), and often [[{{Flanderization}} gets larger as the show goes on.]]

To take even more comedy out of what is already impossible, a character with established access to Infinite Hammerspace may, after packing it full of things, finally fill it up. With Basic Hammerspace, they are more likely to lose access to it for some reason and be unable to retrieve an item.

All PointAndClick adventure games had this to an extent or another, because of the technical limitations of the medium preventing these games from having the hundreds of thousands of sprites necessary to represent your character holding any combination of inventory items you can have. So it's usually treated humorously instead.

The term "Hammerspace" originated in the ''Manga/RanmaOneHalf'' fanfiction community, ironically largely as a result of {{Fanon}}, as neither ''Manga/RanmaOneHalf'' nor the character most often associated with it (Akane Tendo) exhibited this trope to an excessive degree, though it was present in the source material.

'''{{Sub Trope}}s include:'''
* BagOfHolding
* BottomlessMagazines
* HammerspaceHair
* HammerspaceHideaway
* HammerspaceParachute
* HyperspaceArsenal
* HyperspaceHolmesHat
* HyperspaceMallet
* HyperspaceWardrobe
* MisleadingPackageSize
* RummageFail
* ShakeSomeoneObjectsFall
* StomachOfHolding
* TalkingWithSigns
* TreasureChestCavity
* TrouserSpace
* VictoriasSecretCompartment
* WalletOfHolding

Physicists are still split over whether or not there is a Hammerspace-[[Music/MCHammer Hammertime]] [[IncrediblyLamePun continuum]].

!!Example subpages:
* Hammerspace/{{Anime And Manga}}
* Hammerspace/{{Comic Books}}
* Hammerspace/{{Film}}
* Hammerspace/{{Literature}}
* Hammerspace/LiveActionTV
* Hammerspace/{{Tabletop Games}}
* Hammerspace/{{Video Games}}
* Hammerspace/{{Webcomics}}
* Hammerspace/{{Web Original}}
* Hammerspace/{{Western Animation}}

!!Other examples

* The GEICO gecko is apparently an expert at using hammerspace; he is shown to be able to hide a cell phone and wallet larger than his entire body on his person, [[http://www.youtube.com/watch?v=HwUj445MdiU confusing his boss]]. Further confusing the boss is that neither he nor the viewer sees the gecko produce the items. [[spoiler: The cell phone was already on the table and the wallet is seen only after he turns back around after he talks to a waiter.]]
* Cara Confused from the UK's Confused.com ads has been shown to pull various objects from her pocket, including a house! Many people have "confused" this for something dirtier, as the way every instance is animated seems very out of context.

* General: The term "Hammerspace" originated in Fanfic, most likely for ''Manga/RanmaOneHalf'', though the effect itself stems back to the earliest days of animation and graphic fiction.
* ''Fanfic/ACrownOfStars'': The Avaloni soldiers know how creating their own pocket space.
** In chapter 53:
--->'''Shinji''':''“Where did you get this?”''\\
'''TJ''':''“Holdout Pocket technique. A little spatial fold tied to your personal space, good for keeping an emergency backup weapon or something handy. I also keep cold drinks in mine. It’s not a hard trick to learn. First year Weapon Theory stuff. I could probably teach you pretty quickly if you’ve got a gun or a knife you’d like to try it on.”''
* Heavily used in ''Fanfic/BlackQueenRedKing'', where there's a spell to generate it.
* ''Fanfic/ThousandShinji'': Asuka instinctively summoned axes and other bladed weapons out of thin air. She did not knew where she pulled them from or where they went go to. She only knew she was brandishing a weapon whenever she need one and it disappeared after fulfilling its purpose.
* In the ''WesternAnimation/JackieChanAdventures'' and ''WesternAnimation/TeenTitans'' crossover fanfiction ''Fanfic/AShadowOfTheTitans'', Jade mentally lampshades this with Suzano and his staff (bonus points for actually using the ''word'' "hammerspace").
* [[Anime/SailorMoon Mercury]] uses and abuses the [[VideoGame/DungeonKeeper Keeper's]] storage ability in ''FanFic/DungeonKeeperAmi'' to great effect. It can be used to construct complicated machinery and architecture, store spells for later deployment, catch falling minions and deposit them safely, and teleport.
** As a fanfic of the above, the Keepers of FanFic/DungeonKeeperOfLoveAndJustice have the same abilities.
* Calvin grabs ''[[PintsizedPowerhouse a bicycle]]'' out of nowhere in ''Fanfic/CalvinAndHobbesTheSeries''. [[LampshadeHanging "Hey! Where'd you get that bicycle?"]]
* Nanaki (Red XIII) seems to have this in the fic "Courage to Change the Things You Can." It's used as the story's 'real world' explanation for the massive amounts of storage space the game gives you, but no one else understands how he's doing it and whenthe fic's O.C. main character finally gets mad enough about it to demand an explanation Red replies "I understand your confusion. But I like all of you too much to risk making your primitive hominid brains explode from the revelation."
* [[LampshadeHanging Lampshaded]] in the ''FanFic/{{Memoirs}}'' of Manga/InuYasha's [[UnnamedParent father]]. The [[NoNameGiven narrator]] several times wonders where his clothing and equipment go when he transforms into a dog.
** Later hilariously [[ExploitedTrope exploited]] when the characters need to carry a large amount of luggage, so just give it all to the narrator and have him turn into a dog to whisk it all away to HammerSpace.
* In ''Film/JamesBond'' fan film ''WebVideo/DiamondsCut'', [[TerroristsWithoutACause terrorist]] sniper at the beginning of London scene uses a laser sight. Try as hard as you might, there is no way you’re going to find it on his rifle, probably because the actual effect was obtained through the use of laser pointer.
* ''FanFic/HomestuckHigh''; Eridan carries a guitar in his pocket. Particularly bizarre in that the canon actually has sylladexes, a form of technology which would actually permit this, but they seem to be absent from the rest of the fic.
* Used and [[DiscussedTrope discussed]] in the fanfic ''Fanfic/TailsOfTheOldRepublic'', a crossover/ FusionFic between ''Franchise/SonicTheHedgehog'' and the videogame ''Franchise/StarWars: VideoGame/KnightsOfTheOldRepublic''. Tails basically carries a portable pocket dimension in his tails, and he even calls it [[HyperspaceArsenal Hyperspace Inventory]]. It's not perfect, however, and Tails feels the weight of everything he's carrying, and his hammerspace can implode if he loses all his Chaos power. Carth Onasi eventually dubs it "tailspace".
* Loopers in FanFic/TheInfiniteLoops have what they call a subspace pocket. Not only can these hold quite a bit, they also carry between loops. The oldest loopers are said to be able to carry entire solar systems in theirs.
* In the WesternAnimation/DarkwingDuck fanfiction series, ''FanFic/NegaverseChronicles'', Quackerjack tends to pull random toys/weapons, cups of coffee, and other assorted object out of... somewhere.
* In ''Fanfic/RomanceAndTheFateOfEquestria'', AntiHero Venni wears [[HellBentForLeather leather garments]] covered in pockets, from which she produces a variety of weapons and other useful supplies. Falls into this trope when she produces a wrecking ball and a hang glider, which are apparently collapsible.
* In ''Fanfic/ALongJourneyHome'', Jasmine and Myrddin both have one for their Focii. It apparently works but storing them in their soul.

* The Inventories from ''Webcomic/TowerOfGod'' create the illusion of this, but actually, they are just invisible.

* In ''The UltimateShowdownOfUltimateDestiny'' and its video, Abraham Lincoln "took an AK-47 out from under his hat / And blew Franchise/{{Batman}} away with a rat-tat-tat-tat".
* Used as a literal AssPull in Sherry Vine's and Peppermint's [[http://www.youtube.com/watch?v=8685ogp7QRQ Telephone Parody]], where various utensils are pulled out off Sherry's tush... including a ladder!

* Thor of Myth/NorseMythology could make his hammer Mjölnir shrink to an incredibly tiny size, and be pulled out of seemingly nowhere, and is perhaps [[UrExample the first user of this trope]]. Another god owns a ship that he can fold up and stick in his pocket.
* In traditional Chinese folklore, many powerful people essentially had sleeves that could store everything. Being trapped in one was generally a sign that you were screwed.

[[folder:Other Sites]]
* ''Wiki/SCPFoundation''
** SCP items labeled "[[http://www.scp-wiki.net/system:page-tags/tag/ectoentropic ectoentropic]]" will likely implement this trope in some fashion since it means the object generates matter and/or energy in an anomalous manner.
** [[http://www.scp-wiki.net/scp-049 SCP-049 ("Plague Doctor")]]. SCP-049 can produce a bag containing scalpels, needle, and thread from its body and return it to its body when it's finished with it. The bag cannot be detected in any way while inside SCP-049's body.

[[folder:Professional Wrestling]]
* An episode of Monday Night RAW saw Wrestling/TripleH, known for carrying around a sledgehammer, facing off with Wrestling/RandyOrton holding a sledgehammer. Orton suggested they both drop their weapons and just go at it like men. Triple H agreed, both men ditched the hammers they were carrying, and then, after stepping into the ring and removing his jacket, [=HHH=] pulled another full-sized sledgehammer out from behind his back and proceeded to chase Orton away. Now, yes, the second hammer was concealed behind his back the entire time, held by a special rig, but the fact that someone managed to pull off the illusion of Hammerspace on a live television program was impressive.
** Beneath the ring could count, as everything including a kitchen sink has been pulled out from under the ring. Wrestling/{{Hornswoggle}} even lives under the ring and apparently, so do a bunch of similarly sized people. At first, it was just a joke by Wrestling/{{JBL}}, but then after being sued by Hornswoggle, DX has to go under the ring and not only find a full sized courtroom, but [[SerialEscalation a building!]] So yes, on WWE shows, under the ring is officially Hammerspace. It's also been known to contain a portal to Hell.

* ''Roleplay/DestroyTheGodmodder'': Used frequently for everything from inventories to hiding, even used to trap people for short attacks sometimes.
* Both Ruby and Tom in ''Roleplay/RubyQuest'' have Inventories in which they can store up to 8 items.

* In Creator/WilliamShakespeare's ''Theatre/{{Othello}}'', during the eponymous character's final scene, he pulls out weapon after weapon, as if from hammerspace.

[[folder:Web Animation]]
* ''WebAnimation/DeadFantasy Part II''. Yuna reaches into her clothing and pulls out two ether bottles to revive an exhausted Tifa. They're so large that there's no way they could have fit in her clothing normally.
* ''WebAnimation/{{RWBY}}'':
** There is no way Ren's gun-blades should be able to fit into his sleeves, let alone leave no sign that they're there. Nevertheless, that's exactly what happens.
** Professor Ozpin is always seen with either a cane or a coffee mug, never both. The most blatant occurrence is during the show's very first trial which happens on a cliff edge and in the forest below. Ozpin sends the students off while nursing coffee, no cane in sight. Then he's seen monitoring the lesson while leaning on his cane, no coffee mug in sight. Before this event, the fandom already had a RunningGag that the cane and the coffee mug are the same item, morphing between the two states whenever Ozpin MustHaveCaffeine. This event gave that gag wings.
** [[BigBad Cinder Fall]] can apparently use her fire powers to summon a pair of blades, which can also [[SwissArmyWeapon double as a bow]]. There's no indication yet as to exactly ''what'' is going on (Cinder has always been something of an anomaly), but her clothes do glow when she summons them.