A sterile device intended to be fitted to a vial or bottle to enable the airtight removal of its contents (e.g., medication) into a syringe, for subsequent administration to a patient. It is typically a housing that attaches to or replaces the vial lid and incorporates a sealed expansion chamber (e.g., balloon) allowing for pressure equalization intended to prevent the egress and ingress of materials (e.g., vapours, microbes). This is a single-use device.