TuuTyss,No Vacuum Rolling Compression Space Saver Travel Storage Bags Organizer for Clother,Small to Large,Pack of 12 Made by high quality PA+PE material. Package included 12pieces(6 pcs small size + 6 pcs large size).Color is random.Small size(19.6" * 13.5")suggest to carry on thin clothes/trousers 4-6 pieces or thick ones 1-2 pieces like sweaters/down jacket;Large size (23.6" * 15.7") suggest to carry on thin ones 6-8 pieces,thick ones 2-3pieces. Clear back design,easy to identify your clothes. No vacuum needed,use your own weight for rolling up and compression.And it is reusable.Simple place clothes,then close the bags, and roll beginning from the zipper. The air will exit from the bottom of the bags. (see pictures) Great for your travel.organize your dirty clothes into the space saver travel storage bags and create extra space for your suitcase.