A receptacle

A receptacle comprising:

• a container having an opening, the opening having a circular profile and the container extending from a base to the opening along a central axis;
• and
• a lid for closing the opening of the container;
• wherein the lid and container are configured to lock together with only a rotational friction lock, the rotational friction lock comprising a protruding locking tab on a surface of the container or the lid and a locking surface profile defined on the other of the lid or the container, such that there are no portions of the container which are captive between portions of the lid along the central axis;
• and there are no portions of the lid which are captive between portions of the container along the central axis, when the container and the lid are locked together;
• wherein the locking surface is configured to oppose the locking tab when the lid closes the opening of the container, the locking surface having a locking portion, and the locking portion having a continuous surface with a varying radius such that friction between the locking tab and the locking portion varies on relative rotation between the lid and the container.