A portable airtight inner case (W, Z) includes a receptacle (121) for having an item stored therein, for example a guitar (105), a hingedly mounted cover (11, 111) and a perimetric seal (39) to form a fluid seal between the cover (11, 111) and receptacle (121) when the cover is closed. The inner case cover and receptacle are made of a clear rigid plastic. A suction valve or pump (50, 130) opens to the inner case interior to evacuate fluid while a vacuum gauge (53) is provided for measuring the pressure. The inner case bottom wall (32, 117) has a plurality of pockets (74, 148) for having hangers extended therein to hang the case on a wall and stand pockets (142) to have stand parts of a foldable stand (85) extended therein or a stand (144) pivoted to the bottom wall to support the inner case (W, Z) in an inclined condition. A portable outer case (X, 170) has a compartment for containing the inner case.