Hammerspace

Hammerspace (also known as malletspace) is an imaginary extradimensional, instantly accessible storage area in fiction, which is used to explain how characters from animation, comics, and video games can produce objects out of thin air.

This phenomenon dates back to early Warner Bros.' Looney Tunes/Merrie Melodies and MGM cartoons produced during the Golden age of American animation.

For example, in the 1943 Tex Avery short What's Buzzin' Buzzard, a starving vulture prepares to cook his friend by pulling an entire kitchen's worth of appliances out of thin air.

It is believed by some that the term "hammerspace" itself was coined based on the Ranma ½ character Akane Tendo due to the fan perception that she has a tendency to produce large hammers from nowhere.

The City Hunter hammers also require more explaining in terms of storage, as they are often considerably larger than the characters themselves, and thus more likely to inspire questions like, "Where did she get that from!?"

Another series that made extensive use of hammerspace was Kodomo no Omocha, where the mother of the main character would pull toy hammers of varying sizes to tap her daughter on the head to forge breaks in her ranting and offer a chance to glean understanding and wisdom.

Trope-laden webcomic Okashina Okashi – Strange Candy also features hammerspace, this time named directly as such, accessible by the weapons nut Petra.

Early (and some modern) first-person shooter games tend to have the player character carry an entire arsenal of weapons (with a full level of ammunition) without any visible drawback such as loss of pace or fatigue.

In the Grand Theft Auto game series, players are capable of holding an extremely large arsenal and equipment in hammerspace.

In the Fallout series, NPCs and the player use hammerspace extensively, being capable of holding large amounts of weaponry, healing items, and more.