A masking package (100) for blind testing of materials stored in a syringe, the masking package (100) comprising: an opaque housing (110) defining a syringe chamber (111) adapted to substantially surround a plunger and at least a portion of a barrel of a syringe; and a plunger extender (130) slidably receivable in the syringe chamber (111) and comprising a coupler (132) adapted to couple to the plunger of a syringe received in the syringe chamber (111), wherein movement of the plunger extender (130) relative to the opaque housing (110) moves the plunger of a syringe received in the syringe chamber (111) relative to the barrel of the syringe; and a masking package (200) for blind testing of materials stored in a vial, the masking package (200) comprising an opaque housing (210) defining a chamber (211) for receiving and surrounding a vial, the housing (210) having a length between an upper end and a lower end and comprising a first housing part (212) and a second housing part (214), the first and second housing parts (212, 214) being openable along the length of the housing (210) to define an opening in the chamber (211) that extends the length of the housing (210) for inserting a vial laterally into the chamber (211), wherein the housing is formed with a single piece construction.L'invention concerne un emballage de masquage (100) pour l'essai en aveugle de matières stockées dans une seringue, l'emballage de masquage (100) comprenant : un boîtier opaque (110) définissant une chambre de seringue (111) conçue pour entourer sensiblement un piston et au moins une partie d'un cylindre d'une seringue; et un prolongateur de piston (130) pouvant être reçu de façon coulissante dans la chambre de seringue (111) et comprenant un élément d'accouplement (132) conçu pour s'accoupler au piston d'une seringue reçue dans la chambre de seringue (111), un mouvement du prolongateur de piston (130) par rapport au boîtier opaque (110) déplaçant le piston d'une seringue reçue dans la cham