Abstract: A container comprising a container body (1) having a circular opening (4) which defines an axis, a cap (5) to close the opening (4) and a collar (6), the cap (5) comprising an annular skirt (5B) having a plurality of spaced apart projections (5F) around its inner circumference and the collar (6) comprising a ring with a plurality of spaced part flaps (7), (or other radially moveable parts) provided thereon, the collar (6) being arranged to fit between the container body (1) and cap (5) with their axes aligned such that the projections (5F) engage axially facing surfaces (6A) of the ring and the flaps (7) (or other radially moveable parts) engage an axially facing surface (3B) of a lip (or other features) (3) of the container body (1) whereby the cap (5) can be secured to the container body (1).