Today in 1978, US Patent 4071160 A was issued, an invention of Carl J. Vick, assigned to Keg-Tainer, Inc., for his “Insulated Beer Keg Container.” Here’s the Abstract:

A container adapted to receive a beer keg includes a cup-like top section fitting telescopically into the upper portion of a cup-like bottom section having a ring-like rim rolled at opposite points to provide handles. The rim has pairs of slots therethrough for binding straps and also has holes for binding ropes. Each section has an outer skin of a tough plastic with inner and outer walls with the spaces between the walls filled with a plastic foam. The sections are adapted to nest in each other for shipping and handling, and the bottom section has lugs designed to engage the rim of the top section. The top section has an elliptical bung hole to provide access to bungs of different makes of kegs, and a tubular stack may be fitted therein to retain ice for cooling and sealing. The bottom section has a bung access hole in its side which can be sealed by a truncated hollow ball having an opening to receive a tap connected to a lower bung of a keg.