The ornamental design for a storagecontainer, as shown and described.
FIG. 1 is a perspective view of a storage container showing our new design;
FIG. 2 is a rear perspective view of the storage container illustrated in FIG. 1;
FIG. 3 is a front view of the storage container illustrated in FIG. 1;
FIG. 4 is a rear view of the storage container illustrated in FIG. 1;
FIG. 5 is a left side view of the storage container illustrated in FIG. 1;
FIG. 6 is a right side view of the storage container illustrated in FIG. 1;
FIG. 7 is a bottom view of the storage container illustrated in FIG. 1; and,
FIG. 8 is a top view of the storage container illustrated in FIG. 1.
The broken lines in the drawings showing the storage container illustrate the portions of the storage container that form no part of the claimed design.