Here's a breakdown:

* Membranes: The Golgi apparatus is composed of flattened, sac-like structures called cisternae. These cisternae are interconnected and surrounded by a membrane.

* Vesicles: The Golgi apparatus also utilizes small, membrane-bound sacs called transport vesicles. These vesicles bud off from the cisternae and move materials between different parts of the Golgi, as well as to other cellular locations.

So, the Golgi apparatus is a complex organelle that relies on both membranes and vesicles to carry out its functions of processing, packaging, and distributing proteins and lipids within the cell.