An Inventory is an object that contains other things. It is used to track what items are in a container, or which items a Person carries. A different specialized inventory is used to track what apparel a person is wearing (see SmutBook.Apparel).

A trunk or bookshelf might use an inventory to track what is held within or upon it. In a more traditional sort of location-based Twine IF, each location might even use an inventory to track what items the player can find or has dropped there.