User can spawn bags

Pros:
-user can spawn any bag in any material
-user can change colour/patterns/fastenings
-user controls space inside bags theu spawn
-user can exchange items with others through bag
-user can return bags they make with ease

Cons:
-user must know material before using it
-user can't make space in a bag infinite and will be stained if careless
-user must have touched bag to exchange with it and check it is the right person on the other end
-user is twitchy without bags they create
-user must always have a bag summoned to be stable

Weakness: no bag
User is unstable and unpredictable without a bag, made by them or not