Method for reducing spillage when pouring liquid out of a container

A method of reducing spillage when pouring liquid out of a container, comprising the following steps:

• a. firstly, placing a free floating ball into a resilient deformable container adapted for containing liquid, the liquid being of greater density than the density of the ball such that the ball floats upon the surface of the liquid, the container having a first pair of opposed concave sidewalls, a second pair of opposed convex sidewalls, and a fluid flow passage narrower than the dimensions of the ball such that the ball is prevented from exiting through the fluid flow passage;
• b. secondly, exerting a radial inward force upon the concave sidewalls to temporarily deform the container thereby reducing the volume of the inner cavity and causing the liquid in the container to press the ball into a position sealing the fluid flow passage;
• c. thirdly, inverting the container thereby placing the container into a pouring position and then releasing the radial inward force upon the concave sidewalls;
• and
• d. fourthly, in case of pressure lock, exerting a radial inward force upon the second pair of sidewalls, thereby deforming the container to force the concave sidewalls outwardly, thus permitting the member to float away from the fluid flow passage such that liquid freely passes through the fluid flow passage.