Beverage container

A beverage container comprising:

• a lower vessel including:
• a base having a closed end, an open end opposite the closed end, and an outer wall extending from the closed end to the open end, the base defining an internal volume, and
• a neck extending from the open end of the base to an annular ridge that defines a lower vessel opening through which liquid may enter the base;
• an upper vessel including a lower end, an upper end opposite the lower end, an interior surface extending from the lower end to the upper end, and a sealing lip extending radially inwardly from the interior surface to a lip edge, the interior surface and the sealing lip defining an internal volume of the upper vessel between the upper end and the sealing lip, and the upper vessel being sized and shaped to receive the lower vessel neck;
• a vessel seal attached to the sealing lip of the upper vessel, the vessel seal being sized and shaped to form a liquid-tight barrier that prevents liquid from traveling from the interior of the upper vessel to the lower vessel;
• and
• a tether having a first end and a second end, the first end of the tether being connected to the vessel seal and the second end of the tether being connected to the upper end of the upper vessel, the tether being sized and shaped to pull the vessel seal away from the sealing lip when upward force is applied to the tether;
• wherein pulling the vessel seal away from the sealing lip allows liquid from the interior volume of the upper vessel to travel inside the lower vessel.