Abstract: An IV bag including a bladder containing a first substance and a storage cap containing a second substance operable to release the second substance into the bladder to mix with the first substance without exposing the first substance to outside contamination, the storage cap for use with an IV bag including an inner storage chamber for storing a first substance, a first annular opening having a first annular convex surface facing toward the storage chamber, and a plunger element located within the storage chamber having a domed-end with a convex surface facing to the annular opening, wherein the domed end is moveable to make and break contact with the annular opening, and wherein when the domed end is in contact with the first annular convex surface, a seal is formed between two convex surfaces along an annular path to seal the storage chamber.

Abstract: A storage cap for use with a container includes a first structure having a first wall at least partially defining an inner storage chamber operable for storing a first substance and defining a first annular opening having a first annular convex surface facing toward the storage chamber. The storage cap includes a second structure coupled to the first structure and has a plunger element located within the storage chamber having a domed-end with a convex surface facing to the annular opening and a radius greater than one-half of the diameter of the first opening. The second structure is moveable to make and break contact with the annular opening. When the domed end is in contact with the first annular convex surface, a seal is formed between two convex surfaces along an annular path.

Abstract: A storage cap for use with a container includes a first structure having a first wall at least partially defining an inner storage chamber operable for storing a first substance and defining a first annular opening having a first annular convex surface facing toward the storage chamber. The storage cap includes a second structure coupled to the first structure and has a plunger element located within the storage chamber having a domed-end with a convex surface facing to the annular opening and a radius greater than one-half of the diameter of the first opening. The second structure is moveable to make and break contact with the annular opening. When the domed end is in contact with the first annular convex surface, a seal is formed between two convex surfaces along an annular path.

Abstract: A storage cap for use with a container includes a first structure having a first wall at least partially defining an inner storage chamber operable for storing a first substance, the first wall also defining a first annular opening having a first annular convex surface facing toward the storage chamber, and a second structure coupled to the first structure, the second structure including plunger element located within the storage chamber having a domed-end with a convex surface facing to the annular opening, the domed-end having a radius greater than one-half of the diameter of the first opening, wherein the second structure is configured such that the domed end is moveable to make and break contact with the annular opening, and wherein when the domed end is in contact with the first annular convex surface, a seal is formed between two convex surfaces along an annular path to seal the storage chamber.