Hammerspace

Hammerspace is a term used to refer an invisible space where fictional characters can pull out objects larger than the physical space they are stored in. RPGs (Role-Playing Games) refer to this space as a Magic Satchel. In the Sonic continuity, many characters are seen pulling large objects out of nowhere. Usually Chaos Emeralds.

Users
Many characters have been seen having access to Hammerspace, such as:
 * Sonic the Hedgehog
 * Shadow the Hedgehog
 * Amy Rose
 * Knuckles the Echidna
 * Miles "Tails" Prower
 * Dr. Eggman