A cap for a container, comprising: - a disc-shaped top section extending generally in a horizontal plane; - an annular side section projecting substantially perpendicularly from the perimeter of said disc-shaped top section along a vertical axis to an extremity defining a rim portion; - a locking flange disposed at an extremity of said annular side section opposite said disc-shaped top section, and comprising an immobile portion and a mobile portion, and - a locking flap extending from at least a portion of the rim portion of said annular side section and being mobile between, - a locked first position wherein the mobile portion of said locking flange contiguous with said locking flap extends inwardly from an interior face of said annular side section, and - an unlocked second position in which said mobile portion of said locking flange is at least partially recessed relative to said interior face of said annular side section, characterized in that it further comprises a first tamper evident means comprising tamper evidence member attached to the annular side section and to the locking flap, said locking flap being thereby immobilized in the locked first position when the tamper evidence member is in place defining thereby its functional position, the tamper evident member being partially frangible when the cap is first opened allowing the locking flap to reach the unlocked second position and in that the tamper evidence member remains attached to one of annular side section or locking flap after the cap is first opened. - a disc-shaped top section extending generally in a horizontal plane; - an annular side section projecting substantially perpendicularly from the perimeter of said disc-shaped top section along a vertical axis to an extremity defining a rim portion; - a locking flange disposed at an extremity of said annular side section opposite said disc-shaped top section, and comprising an immobile portion and a mobile portion, and - a locking flap extending from at least a portion of the rim portion of said annular side section and being mobile between, - a locked first position wherein the mobile portion of said locking flange contiguous with said locking flap extends inwardly from an interior face of said annular side section, and - an unlocked second position in which said mobile portion of said locking flange is at least partially recessed relative to said interior face of said annular side section, characterized in that it further comprises a first tamper evident means comprising tamper evidence member attached to the annular side section and to the locking flap, said locking flap being thereby immobilized in the locked first position when the tamper evidence member is in place defining thereby its functional position, the tamper evident member being partially frangible when the cap is first opened allowing the locking flap to reach the unlocked second position and in that the tamper evidence member remains attached to one of annular side section or locking flap after the cap is first opened. - a locked first position wherein the mobile portion of said locking flange contiguous with said locking flap extends inwardly from an interior face of said annular side section, and - an unlocked second position in which said mobile portion of said locking flange is at least partially recessed relative to said interior face of said annular side section, characterized in that it further comprises a first tamper evident means comprising tamper evidence member attached to the annular side section and to the locking flap, said locking flap being thereby immobilized in the locked first position when the tamper evidence member is in place defining thereby its functional position, the tamper evident member being partially frangible when the cap is first opened allowing the locking flap to reach the unlocked second position and in that the tamper evidence member remains attached to one of annular side section or locking flap after the cap is first opened.