The ornamental design for a handle for a container, as shown and described.
FIG. 1 is a perspective view of a handle for a container, showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown are included for the purpose of illustrating unclaimed portions of the article and form no part of the claimed design. The dot-dash lines represent the boundaries of the claim and form no part thereof.