Combination bottle and can cooler

An insulating holder for holding either a rigid bottle having a top with a neck that increases in diameter down to a shoulder, with a larger diameter bottom half, and a bottom, or for a beverage can having a generally cylindrical diameter with a substantially flat top and bottom, the insulating holder comprising:

• a lower cylindrical enclosure formed of insulating material having a closed first end and an open second end defining a cylindrical interior with an interior wall larger in diameter than the bottom half of the rigid bottle, a plurality of vertical ribs arranged around the interior wall of the lower cylindrical enclosure;
• an invertible upper cylindrical enclosure formed of insulating material having a dome-shaped first end with a circular opening therein sized to pass the diameter of the bottle neck, and an open second end defining a cylindrical interior with an interior wall, the diameter of the upper cylindrical enclosure being sized to fit within the cylindrical interior of the lower cylindrical enclosure while being in contact with the plurality of vertical ribs on the interior wall of the lower cylindrical enclosure, a plurality of shims arranged around the interior wall of the upper cylindrical enclosure, the shims sized to contact the cylindrical diameter of a beverage can, and pass the bottom half of the bottle;
• whereby when the lower cylindrical enclosure contains at least a portion of the bottom half of the bottle, the upper enclosure encloses the bottle from the shoulder down, when the upper enclosure is inserted into the lower enclosure at the upper enclosure open second end, allowing the neck of the bottle to pass through the circular opening in the dome-shaped first end, and when the upper enclosure contains a beverage can, the upper enclosure with the beverage can may be inserted into the lower enclosure second open end, at the upper enclosure dome-shaped first end.