Abstract: A vessel cooling system may include a beverage holding device, having a bottom with a slit having a length. The system may also include a cooling device, having a convex top configured to be received by a concave bottom of a beverage vessel. The cooling device may have a top sheet of thermoplastic polyurethane, a bottom sheet of thermoplastic polyurethane affixed to the top sheet of thermoplastic polyurethane forming a cavity therebetween, and a shaped depression in the center of the convex top. The cooling device may further include a rigid portion, having a circumference, disposed on the bottom of the cooling device, a lip, having an upper surface with a plurality of raised ridges, formed on the circumference of the rigid portion and configured to contact the perimeter of the concave bottom of the beverage vessel, and coolant, that contracts as its temperature raises, contained within the cavity.

Abstract: A vessel cooling system may include a beverage holding device, having a bottom with a slit having a length. The system may also include a cooling device, having a convex top configured to be received by a concave bottom of a beverage vessel. The cooling device may have a top sheet of thermoplastic polyurethane, a bottom sheet of thermoplastic polyurethane affixed to the top sheet of thermoplastic polyurethane forming a cavity therebetween, and a shaped depression in the center of the convex top. The cooling device may further include a rigid portion, having a circumference, disposed on the bottom of the cooling device, a lip, having an upper surface with a plurality of raised ridges, formed on the circumference of the rigid portion and configured to contact the perimeter of the concave bottom of the beverage vessel, and coolant, that contracts as its temperature raises, contained within the cavity.