Abstract: A closable, stackable packing container made of insulating material for the storage of perishables and transport thereof without the need for refrigeration in transit comprises a tray (1) and a lid (2) to tightly close the container. Projections (9) on the wall and correspondingly shaped and positioned recesses (10) in the tray and in the lid are asymmetrically arranged. The container may be used in a transit mode wherein projections (9) fit within and mate with corresponding recesses (10) in lid (2) so that the container is substantially airtight. Or, the container may be used in a storage mode wherein lid (2) rests on top of projections (9) and is then spaced from the rim to allow circulating refrigerating air to flow into the tray and around the contents to cool them. A plurality of containers may be stacked in either mode.