and the sidewall 18 are tightly adapted to the outer surface of the container 50 then by unfurling or unrolling the bulged portion 19 the sidewall 18 u2032 of the cover 10 starts to expand in axial direction z thereby wrapping around the entire container 50 for instance around the entire barrel 52 of a syringe 50 as shown in fig5 and 6 the barrel 52 is typically translucent and can be protected against electromagnetic radiation by means of the stretchable light protective cover 10 the syringe 50 as shown in fig5 and 6 typically comprises a piston 56 slidably disposed in the inner volume of the barrel 52 the piston 56 is connected via a piston rod 58 with a laterally extending pressure piece 55 by way of which distally directed pressure can be exerted to the piston 56 for displacing the same towards the outlet port 54 the syringe 50 as illustrated in fig5 and 6 further comprises a radially outwardly extending rim 57 at its proximal end which allows a user to apply a counter force to the barrel 52 during a dispensing action typically the radially extending rim 57 serves as a support for index finger and middle finger of a user typically making use of his thumb to exert distally directed pressure to the pressure piece 55 the sidewall 18 u2032 of the unfurled light protective cover 10 u2032 comprises a reinforcing structure 52 at its free end opposite the bottom portion 12 the reinforcing structure 22 may comprise.