The sacs that contain materials in a eukaryotic cell are called vesicles.

Here's a breakdown:

* Vesicles: These are small, membrane-bound sacs that transport materials within the cell. Think of them as tiny "packages" that move things around.

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

* Transport vesicles: Move materials between different organelles.

* Secretory vesicles: Carry substances (like hormones or enzymes) to the cell membrane for release outside the cell.

* Lysosomes: Contain enzymes that break down waste materials and cellular debris.

* Endosomes: Help sort and deliver materials taken in from outside the cell.

Let me know if you'd like more detail on any of these types!