A beverage container (1) comprises a container body (3) including an opening, a cap (5) to close the opening, and a collar (7), mountable on the container body (3). The cap (5) and the collar (7) include cooperating securement means (19, 21) by which the cap (5) may be secured to the collar (7), thereby securing the cap (5) to the container body (3) when the collar (7) is mounted on the container body (3). The cap (5), the collar (7) and the container body (3) are configured such that removal of the cap (5) from the container body (3) causes removal of the collar (7) from the container body (3).