The ornamental design for a beveragecontainer, as shown and described.
FIG. 1 is a top perspective view of a beverage container showing my new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom view thereof.
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 form no part of the claimed design.