In a cell, small vacuoles that are involved in transporting substances are often called vesicles.
Vacuoles are the "storage" containers of cells. They are responsible for transporting substances between cells as well as between the organelles of cells. These transporters are made structurally sound by a bilipid membrane.
Smaller versions of these transporters form naturally during exocytosis. These small vacuoles involved in transporting substances are often called vesicles. Like the larger vacuoles they are formed by a bilipid membrane and the substance they carry, or cytosol in its absence.
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