The ornamental design for a collapsibleinsulatingcontainer, as shown and described.
FIG. 1 is a bottom front perspective view of a collapsible insulating
container showing my new design in a collapsed state;
FIG. 2 is a bottom front perspective view thereof in an open condition; and
FIG. 3 is a top rear perspective view thereof on a reduced scale with a
bottle being shown in broken lines as illustrative of environmental
structure only.