The Celestial Inventory comes with a dimensional pocket where you can store and retrieve objects, liquids, gases, or any other tangible thing. The pocket space has unlimited capacity and contained entities do not come into contact.
You can move an object of any size smaller than 100m3 instantly, larger objects will take 1s per additional 100m3. You can only move objects as a whole, you cannot only store part of a building for example. Liquids and gases move at a rate of 100m3 per second. You can move arbitrary volumes of liquids and gasses.
The pocket dimension has its own search and favorites system.