The invention relates to a blister package (500, 700, 800, 1000, 1100, 1200, 1320, 1420) for packaging a dispense interface (200, 2000) of a medicament ejection device, with a blister (510, 710, 810, 1010, 1110, 1210) having a cavity portion (512, 712, 812, 1012, 1112, 1212) and a flange (514, 1014, 1214), the cavity portion (512, 712, 812, 1012, 1112, 1212) defining a cavity (516) and being configured to hold a dispense interface (200, 2000) of a medicament ejection device within the cavity (516), and with a lid (520, 720, 1020, 1120, 820) bonded to the flange (514, 1014, 1214) of said blister (510, 710, 810, 1010, 1110, 1210), wherein the cavity portion (512, 712, 812, 1012, 1112, 1212) of said blister (510, 710, 810, 1010, 1110, 210) comprises at least one undercut portion configured to interact with a corresponding part of a dispense interface (200, 2000) to be packaged in the blister package (500, 700, 800, 1000, 1100, 1200, 1320, 1420) to lock the dispense interface (200, 2000) within the cavity (516).The invention also relates to a system comprising a dispense interface (200, 2000) of a medicament ejection device and a blister package (500, 700, 800, 1000, 1100, 200, 1320, 1420) as described before, wherein the blister package (500, 700, 800, 1000, 100, 1200, 1320, 1420) is adapted to the dispense interface (200, 2000).Linvention concerne un emballage-coque (500, 700, 800, 1000, 1100, 1200, 1320, 1420) destiné à emballer une interface de distribution (200, 2000) dun dispositif déjection de médicament, une coque (510, 710, 810, 1010, 1110, 1210) ayant une partie cavité (512, 712, 812, 1012, 1112, 1212) et une bride (514, 1014, 1214), la partie cavité (512, 712, 812, 1012, 1112, 1212) définissant une cavité (516) et étant conçue pour maintenir une interface de distribution (200, 2000) dun dispositif déjection de médicament dans la cavité (516), et un couvercle (520, 720, 1020, 1120, 820) relié à la bride (514, 1014, 1214) de ladite coque (510, 710, 810, 1010, 1
