Add a rule called “Inventory” with:

Each Prince has an Inventory, tracked on the GNDT, which contains between zero and three items (for example, “Banana, Grape, Tomato”) and defaults to zero. Each item is one noun. By spending 1 Stamina, a Prince can Take a Noun, adding to their inventory a noun which exists at the Katamari’s current Location. At-will, a Prince can remove an item from their inventory.

If a Prince has one of these items (nouns) in their inventory, they gain the corresponding ability listed:
- Backpack: The Prince carries between zero and six items, instead of just zero to three. The Prince cannot have more than 10 Stamina at any time.
- Coffee: The Prince may drink (remove) a “Coffee” from their inventory to gain 3 - X Stamina, where X is the amount of times they had drank coffee via this mechanic.