Final answer:
A vesicle is the organelle that transports material around the cell and is characterized by its ability to separate material from the rest of the cell due to its membrane-bound structure.
Step-by-step explanation:
The organelle that is a membrane-bound sac and which divides material from the rest of the cell and transports material around the cell is known as a vesicle. Vesicles are essential in the effective operation of a cell and play a crucial role in cellular storage, transport, and logistics. They are small, spherical compartments that help in the segregation and transport of various substances within the cells. Vesicles are formed in areas such as the Golgi apparatus and the endoplasmic reticulum or from portions of the cell membrane and are capable of fusing with the plasma membrane and other membranes within the cell system. This functional versatility is made possible by their membrane which can fuse with the plasma membrane and the membranes of the endoplasmic reticulum and Golgi apparatus, allowing for the exchange and dispatch of materials both within the cell's interior and to its exterior.