in a synthetic - material container for special waste which has elements of reducing the volume of the waste by shredding , which elements consist of a number of rotating cutting elements that force the waste against stationary cutters , these elements are composed of one or more rotating horizontal cutting elements which are mated with stationary horizontal cutters , as well as at least one pair composed of vertical cutting elements and of second stationary vertical cutting elements that are arranged downstream from horizontal cutting elements and above - mentioned horizontal cutting elements and which act in such a way as to shred again waste that is introduced into the container , further reducing its volume , whereby said the horizontal rotating cutting elements are able , by their rotation , to create a certain overpressure toward the bottom of the container .