Compression Packing Cubes for Travel, 4 Set Packing Cubes for Carry-on Luggage SPACE SAVER: Compression packing cubes help you with eliminating the extra bulk of your luggage by compressing the air out of the clothes. These compressible packing cubes use a two zipper system to literally compress your clothes together, save up to 60% space of your luggage and help you carry more in the same bag.