The ornamental design for a beveragecontainercap, as shown and described.
FIG. 1 is a top, front perspective view of a beverage container cap, shown in a first configuration for use with the straw stowed within the cap.
FIG. 2 is a top, front perspective view of the beverage container cap, shown in a second configuration for use with the straw extended from the cap.
FIG. 3 is a front elevation view of the beverage container cap of FIG. 1.
FIG. 4 is a rear elevation view thereof.
FIG. 5 is a left-side elevation view thereof.
FIG. 6 is a right-side elevation view thereof.
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
In the drawings, the broken lines depict portions of the beverage container cap that form no part of the claimed design. In FIG. 6, the broken lines showing a beverage container depict environmental subject matter. The broken lines form no part of the claimed design.