A bucket lid designed with the purpose of making available to users a built-in stick in a certain space integrated in the lid itself. The stick is subsequently used in the homogenization of the product stored inside the bucket. The stick is preferably made of polymeric material and can be telescopic to reach the bottom of the bucket during mixing, optionally including a radially inserted ring that facilitates its removal from the central recess and the semi-circular pressure fittings existing in the lid.

In some examples, an instrument closure may include an instrument closure retainer to retain the instrument closure onto a container. The instrument closure may further include a sensor retainer including a plurality of apertures for transfer or removal of material, respectively, into or from the container. The sensor retainer may further include a sensor mount to retain a sensor.