Abstract: A cup 1 and a container assembly including the cup 1 are predominantly moulded in plastics. The cup has a bowl 2 with a cylindrical portion 4 having a rim 5 and from which extends a conical portion 6. External flanges 20B and 21B are provided on the conical portion 6 and internal flanges 10 and 11 are provided on the portion 4 so that two cups 1 and 1A can be bayonet fitted together by engagement of the internal flanges 10, 11 of one cup with the external flanges 20B and 21B respectively of the other cup. Co-operation between an abutment face of the internal flange 11 and an external projection 30 provides stop means which reacts between the two cups to predetermine a rotational condition of the two cups. Securing means provided by co-operation of a stud 35 and dimple 36 between the two cups maintains the cups at said predetermined condition of rotation. The cup may have a handle 28 and when the stop means and securing means is effective the handles 8 of the two cups are in alignment.