General:
* Stationery
* Paper products
* Paperware
* Paper supplies
* Paper articles
More specific:
* Disposable tableware (for plates, cups, cutlery)
* Tableware (more formal than disposable tableware)
* Party supplies (for balloons, decorations, etc.)
* Packaging (for boxes, bags, etc.)
* Writing materials (for notebooks, pens, etc.)
* Office supplies (for folders, binders, etc.)
Informal:
* Paper stuff
* Paper things
The best word to use will depend on the specific items you are referring to and the context of your conversation.