Summary of Vesicles. Vesicles are small cellular containers that perform a variety of functions. They can be used to move molecules, secrete substances, digest materials, or regulate the pressure in the cell. To unlock this lesson you must be a Study.com Member. Create your account.ysosomes are used by cells to break down food particles and to get rid of unneeded cellular materials. Transport vesicles move molecules within the cells. All cells make proteins and require them to function.