I know the term "writing utensil", "writing implement", or "writing instrument" can be used to encompass anything you would write with such as pen, pencil, stylus, etc. but I am looking for it's counterpart that encompasses all things you might write on such as paper, papyrus, notebook, clay tablet, etc.
To clarify, I am looking for a word that encompasses the whole thing you write on or in so "writing surface" does not quite fit as you would not say something like "Pick up your writing surfaces". That For example, the writing surface of a notebook is just the page you write on, unless I am wrongnot the whole notebook, and thisthe writing surface of a an iPad is something that some people say which I am just unaware ofthe screen, not the whole iPad.