A dispenser for substances includes an outer shell with a deformable outer wall which encloses the deformable container arrangement and also comprising at least one balancing valve for balancing air, wherein an air filled interspace is provided between the outer wall and the container arrangement and substances are dispensed once the outer shell has been subjected to pressure, and wherein the container arrangement has at least two containers for the separate storage of liquid for pasty substances. For long term storage of the substances in particular an outlet portion of the container arrangement has a diffusion seal made from metal which is pierced and opened by the dispensing head using points just before the dispenser is being used.