Abstract: A foldable organizer includes a number of panels hingedly coupled to each other to form a number of defined compartments. The hinged couplings between panels allow the panels to hinge relative to each other preferably through approximately 180 degrees or more. The organizer is foldable to collapse one or more compartments and the area of each compartment is infinitely adjustable so that the organizer can be adjusted to fit in different sized spaces. Expanding the organizer to its maximum allowable size within a given space keeps the organizer secure from movement. The foldable organizer is advantageously used in the trunk of an automobile to protect grocery bags from spilling their contents when the automobile is in motion. The organizer can be constructed from a single flat blank which is cut, folded and fastened or from several such blanks. A kit containing one or more blanks with appropriate fasteners is also disclosed.