Abstract: A cubiform cushioning medium 4 comprises a planar cushioning medium 1 with a plurality of cells 12 formed by partially bonding non-breathable flexible resin sheets and the cells 12 which air is encapsulated thereinside, and the planar cushioning medium 1 is folded and bonded partially to complete an opening A to be protected for containing. The cubiform cushioning medium 4 thus has lateral cushioning faces 31, 34 disposed at the side of the opening 42 and an bottom cushioning portion 35 disposed at the bottom of the opening 42 by bending the planar cushioning medium 1 at the bottom end of the lateral cushioning mediums 31, 34 so that the end cushioning medium 35 is folded upward to the top of the lateral cushioning mediums 31, 34.

Abstract: The present invention relates to a shut-off valve of limiting flow to a single direction, and a shut-off valve of removing air from the sack and charging the sack with air as well. The shut-off valve has an air passage of a flat and substantially cylindrical form in cross section, which is formed by opposed cladding sheets. The cladding sheet is provided with a valve body sheet which comprises a fixed part attached to the cladding sheet and flap portions with the fixed part placed in the central position therebetween, which flap portions are movable in a vertical direction. One flap portion serves to prevent air from flowing in one direction within the air passage by the close contact with cladding sheet, while the other flap portion serves to prevent air from flowing in the other direction by the close contact with the cladding sheetu The shut-off valve may perform a double function of removing air from the sack and charging the sack with air accordingly.

Abstract: A compression sack constituted by non-breathable front and back sheets and having an opening formed in a part of the compression sack. The opening includes an access port for articles and air outlet, and closing means provided therein for tight closing and opening purposes. The access port and air outlet are separated by a separating member at which the front and back sheets are firmly joined together. The separating member extends from a side of the opening inwardly of the compression sack, thereby forming a deaeration passage between the air outlet and the inside of the compression sack. A spot seal is provided more inwardly of the sack than the end at the interior side of deaeration passage, and the separating member is bent at the end of the interior side of the deaeration passage in a direction of the deaeration passage.