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An insulative jacket for a beverage container is fabricating from a unitary blank of flexible insulative material into a main body forming an annulus with continuous upper and lower edges openable into an annular form for receiving the beverage container and collapsible along diametrically opposed f

An insulative jacket for a beverage container is fabricating from a unitary blank of flexible insulative material into a main body forming an annulus with continuous upper and lower edges openable into an annular form for receiving the beverage container and collapsible along diametrically opposed fold lines into a flattened rectangular form when not in use, and a circular end wall connected to the lower edge of the annulus at diametrically opposed locations with a sewn fold line bisecting the wall to urge it to fold inwardly within the annulus when collapsed into the flattened rectangular form.

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[ What is claimed is:] [1.] An insulative jacket for a beverage container, comprising a main body formed of a flexible insulative material in a configuration forming an annulus with a continuous upper edge and a continuous lower edge openable into a generally annular form defining an interior area o

[ What is claimed is:] [1.] An insulative jacket for a beverage container, comprising a main body formed of a flexible insulative material in a configuration forming an annulus with a continuous upper edge and a continuous lower edge openable into a generally annular form defining an interior area of a shape and dimension for receiving the beverage container through the upper edge and collapsible along diametrically opposed fold lines into a flattened rectangular form when not in use, and a generally circular end wall connected to the lower edge of the annulus at diametrically opposed locations with a fold line bisecting the wall between the opposed locations and biased inwardly of the annulus to urge the wall to fold within the annulus when collapsed into the flattened rectangular form.