Abstract: A container (6) and a metering cap (3) are designed to be fitted together and include a cap (3) defined as a concave component with a curved top and a sloping cylindrical neck on the side thereof, with a mouth (1) that can be closed by a stopper (T), the lower distal end (1a) of the neck extending into the concave cavity defined by the cap (3), wherein this extension does not project beyond the bottom plane defined by the lower peripheral edge (9) of the cap (3); and wherein the container (6) comprises a hemispherical protrusion (2) which corresponds to a cavity (Oi) located on one side of the top of the container (6).