The packages that contain materials such as proteins made by the cell are called vesicles.

Here's a breakdown:

* Vesicles are small, membrane-bound sacs that transport materials within the cell and to the outside of the cell.

* Proteins are one type of material that can be packaged into vesicles. Other materials include lipids, carbohydrates, and even other organelles.

* The process of packaging materials into vesicles is called exocytosis. This involves the vesicle fusing with the cell membrane and releasing its contents outside the cell.

There are different types of vesicles, each with a specific function:

* Secretory vesicles release substances such as hormones, enzymes, and neurotransmitters outside the cell.

* Transport vesicles shuttle materials between different organelles within the cell.

* Endocytic vesicles bring materials from outside the cell into the cell.

Let me know if you have any more questions!