An openable securing ring for holding a lid or similar closure on a container has a latch mechanism arranged to secure ends of the ring releasably together at a circumferential break. A circumferentially extending recess is provided at a radially inner portion of the latch mechanism so that the radially inner portion is of reduced axial external thickness and provides relief for stable stacking of a first container on top of a second container when the securing ring is attached to the second container. A radially inner edge of a locking lever side wall may lie radially outward of the inner diameter of one ring end to define at least part of the reduced thickness radially inner portion.