Dimensional Storage

Summary
Dimensional Storage (also called Hammerspace or Magic satchel) is ability to store as many items as one wishes in a sort of "storage area" without any regard for running out of room. Users are then able to summon the desired back item (s) to their whim, making it seem as if they pulled the object out of thin air.

This ability typically isn't amused with any canonical explanations in fictional works.

Users

 * Many video game characters and Toon Force wielders
 * Ramona Flowers (Scott Pilgrim vs. the World)
 * Pinkie Pie (My Little Pony: Friendship Is Magic)
 * Etcetera...