In Hazebound, a wondrous world of magic, turning any bag into an extra-dimensional space is a trivial matter. Any sentient creature can perform the following ritual.

Ritual of Spatial Expansion

Action Points: 10 minutes  // Willpower Points: 4

Range: Self // Duration: Instantaneous

Components: A bag with a capacity of at least 20L

At the end of this ritual, the bag turns into an extra-dimensional space. Items placed in this bag are stored in an extra-dimensional space bound to the creator.

 This space can hold any number of objects. Retrieving something from the bag requires the user to think of what they want to grab, and it will appear in their hands. If you do not know what the bag contains, you can simply think of something, and one item at random will show up.

Each creature can only have one extra-dimensional bag at a time. Creating a new bag destroys the existing one at the end of the ritual. While the bag might change, the extra-dimensional space remains the same, containing the same items; its provenance is bound to you. If you die, all items contained in that space spill onto the ground.

The bag becomes non-functional if it is pierced or torn, in which case you lose the ability to withdraw objects from the extra-dimensional space.