The ornamental design for a beveragecontainer, as shown, and described.
FIG. 1 is a perspective view of a beverage container, showing our new design;
FIG. 2 is a side view of a beverage container;
FIG. 3 is an alternate side view of a beverage container;
FIG. 4 is a bottom view of a beverage container;
FIG. 5 is a top view of a beverage container; and,
FIG. 6 is a perspective view of a beverage container in a use environment with its top removed.
The broken lines in the drawing views represent unclaimed portions of a beverage container, which are included for the purpose of illustrating unclaimed environment only, and forms no part of the claimed design.