The ornamental design for a portable fire container, as shown and described.
FIG. 1 is an exploded perspective view of components of the portable fire container in a stack ready for packaging in accordance with the design of this invention;
FIG. 2 is a perspective view of the portable fire container of FIG. 1;
FIG. 3 is a perspective view with lid removed from the portable fire container of FIG. 1 for clarity of illustration;
FIG. 4 is a front view of the portable fire container of FIG. 1; and,
FIG. 5 is a side view of the portable fire container of FIG. 1.