System (10) for efficient distribution and storage of new and used sharp objects (50), the system comprising: a first container (20) having at least one repositionable wall part (24), presenting said part of repositionable wall a first position and a second position, in which when the repositionable wall part is in the first position, the first container defines a hole large enough to allow the removal of a number of sharp objects, said sharp objects being selected between pen needles, hypodermic needles and syringes with coupled hypodermic needles, of the first container, in which also when the repositionable wall part is in the second position, said hole is closed； the first container (20) also defining a first opening (30) comprising an associated unidirectional mechanism for transporting a sharp object used from the outside of the first container to the inside of the first container, in which said sharp object is selected from needles pen, hypodermic needles and syringes with attached hypodermic needles； cooperatively defining the repositionable wall portion (24) and the first container (20) an irreversible locking mechanism for fixing said repositionable wall to the first container when the repositionable wall is in the second position, thereby forming a complete receptacle； and a second container (40) sized to fit inside the first container and be removed from the first container through the hole therein, in which said second container contains the amount of sharp objects and further comprises a dispensing mechanism for sharp objects without using； or a second container that has a retracted configuration and an expanded storage configuration, sized to contain the amount of unused sharps that may be contained within the first container and further comprising a dispensing mechanism for unused sharps； so that the system has a first configuration that has a first volume substantially equal to the volume of the first container and a second configuration equal in vo
