The appliance has a container that is formed of folded sheet material which bounds an internal chamber and includes a plurality of walls. The container is deformable between a first condition in which the volume of the internal chamber is at a minimum and a second condition in which the volume of the chamber is at a maximum. The container is capable of aspirating a medium when deformed from the first towards the second condition and of expelling a medium when deformed from the second toward the first condition.
A variable-volume container for fluids that is formed of a body portion and two end portions. The body portion comprises four rigid walls with each wall being joined to the next adjacent wall by a longitudinal fold line to permit collapsing of the container. The end portions of the container, each comprise, four sets of two triangular portions joined at fold lines to one another and to the walls of the body portion to permit the container to collapse without mechanical strain and substantial longitudinal motion of the end portions.
A storage a pair of outer surfaces, a flexible corrugated bottom surface, a head end having a closeable filling opening, and horizontal standing edges which connect the outer surfaces to the bottom surface. The storage bottle is made from synthetic material and is stable in an unfilled state, and the bottom surface conforms to a surface upon which it is placed.
