Bottle cap

A cap for sealing a bottle containing a liquid energy supplement, the cap comprising:

• an annular outer skirt having an inner surface and an outer surface, a top portion of the outer skirt forming an annular rim;
• a generally concave top wall extending inwardly from and below a plane defined by the rim, the top wall having a top face and a bottom face, wherein the diameter of the concave top wall is at least about 80% of the diameter of the cap;
• and
• an annular inner skirt extending downward from the top wall bottom face and disposed radially inward from and concentric with the outer skirt, wherein the inner skirt is configured to sealingly engage with an inner surface of a neck of the bottle to prevent oxidation of the liquid energy supplement when the cap is attached thereto.

A cap for sealing a container having a neck, the cap comprising:

• an annular outer skirt having an inner surface and an outer surface, a top portion of the outer skirt forming an annular rim;
• a generally concave top wall extending inwardly from and below a plane defined by the rim, the top wall having a top face and a bottom face, wherein the distance from the center of the top wall top face to the plane defined by the rim is at least about 10% of the height of the cap, and wherein the top face of the top wall includes indicia;
• and
• an annular inner skirt extending downward from the top wall bottom face and disposed radially inward from and concentric with the outer skirt, wherein the inner skirt is configured to sealingly engage with an inner surface of the container neck when the cap is attached thereto;
• wherein the top wall extends inwardly at a steep angle proximate to the rim such that a shadow is formed around a periphery of the top wall, thereby creating a shadow box effect with respect to the indicia.