FIG. 1 is a perspective view of a belt clip for a container showing my design; FIG. 2 is a side view thereof; FIG. 3 is a front view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a top view thereof; and, FIG. 6 is a bottom view thereof. The broken line showing is included for the purpose of illustrating and forms no part of the claimed design.