The ornamental design for a handle for beveragecontainer, as shown and described.
FIG. 1 is a top, front perspective view of a beverage container handle, with the top, back perspective view being a mirror image;
FIG. 2 is a front view of a beverage container handle, with the back view being a mirror image with the exception of the coil spring element; and,
FIG. 3 is a top view of a beverage container handle.
The broken lines shown are included for the purpose of illustrating the environment in which the article resides and form no part of the claimed design.