Molded collapsible solution container having transverse fold lines

Claim 1

In a collapsible solution container, which container defines a body portion having an integral neck portion and a semi-rigid shoulder portion at one end thereof, and is sealed at its end opposite said one end, said body portion defining, in its original, unstressed state, generally oval, transverse cross sections adjacent said neck and shoulder portions, said cross sections tapering progressively along a major portion of its length to a flat, sealed end portion at said end of the container opposite to said one end; transverse lines of folding weakness defined along opposite edges of said shoulder portion to facilitate the collapse of said container, and gusset portions defined in said body portion adjacent said shoulder portion and adjacent the ends of said transverse lines of folding weakness, said gusset portions including lines of flexing weakness to facilitate collapse of the container adjacent said shoulder portion, whereby said container collapses to a uniform flat configuration progressively from said opposite end toward said one end as the contents thereof are withdrawn through said neck portion, the transverse lines of folding weakness and gusset portions causing said container to collapse about the inner surface of said shoulder portion as the container empties, whereby the residual volume of said collapsed container is minimal.