The cube is compressed by the middle zipper; Using steps: 1) Fold and flatten clothes. 2) Pack clothes in the cube and zip the front zipper Special structure of the Cordura fabric makes it has superior wear resistance, tear resistance, so they can with stand long time use. Classifying and organizing your belongings for your travel will become easy with these lightweight packing organizers. Save up to 50% space by compressing the packing cubes via the exterior compression zippers and all the zippers are SBS zippers, it makes sure the packing organizers open and close easily.