The ornamental design for a bag with handle, as shown and described.
FIG. 1 is a perspective view of a bag with handle;
FIG. 2 is an elevation view of the top portion of the bag with handle;
FIG. 3 is a top view;
FIG. 4 is a front side view;
FIG. 5 is a left side view;
FIG. 6 is a right side view; and,
FIG. 7 is a back side view.
The broken line showing of portion of the bag is included for the purpose of illustrating environmental structure and forms no part of the claimed design.