Abstract: The invention is for an instrument carrying case comprising an open-topped box, a lid having a substantially planar panel for covering the top of the box, and a flexible hinge joining the rear edge of the lid to the top edge of the rear wall of the box such that the lid is movable through an angle of about 270.degree. from a position at which its panel covers the box to an "inside-out" position for the lid at which such panel is adjacent and substantially parallel to the outside of the rear wall of the box, and in which the normally forward part of the lid projects laterally beyond the bottom of the box. The case further comprises a fastening means for securing the box and the lid together when the latter is in such inside-out position.