- See also: Extraplanar
The term extradimensional describes a metaphysical existence outside of any plane or dimension. (The term nondimensional is synonymous.) For example, a bag of holding stores objects in a tiny extradimensional space that does not exist on any dimension, including the dimension on which the container itself exists.
Extradimensional spaces can serve many functions, and are most often created as a result of magic, particularly spells and magic items. For a list of magic related to extradimensionality, see Category:Extradimensional magic.
Reactions between extradimensional objects
Extradimensional spaces can be subject to unusual reactions when combined. For instance, placing an extradimensional container into the extradimensional space of a rope trick. Doing so prevents access to the container's extradimensional space until the container is removed from the space. Another example involves direct interactions between a bag of holding and a portable hole, which can destroy or exile both objects and create a planar rift or portal to the Astral Plane.