The ornamental design for the foldable packing case with optional attachable cover, as shown and described.
FIG. 1 is an illustrative top front perspective view of a foldable packing case with optional attachable cover according to my new design, wherein the packing case is shown open and with the optional cover unattached;
FIG. 2 is an illustrative top front perspective view of the design of FIG. 1 with the optional cover removed;
FIG. 3 is a perspective side view of the design of FIG. 2 shown in a collapsed state;
FIG. 4 is a bottom plan view of the design of FIG. 2;
FIG. 5 is a top plan view of the design of FIG. 2;
FIG. 6 is an illustrative top rear perspective view of the design of FIG. 1 with the optional cover attached and closed;
FIG. 7 is a side view of the design of FIG. 6; and,
FIG. 8 is an unfolded view of the foldable packing case with optional attachable cover.
Containers for transferring merchandise between distribution service centers and retail stores, while security sealed in either an expanded or a reduced volume configuration