①. Twist-up compression design, no vacuum needed, just use your hands to grip, twist and zip. More convenient when traveling and don't have to worry about your shirts getting wrinkled anymore. ②. Vacuum bags are lightweight. 12 pieces vacuum bag, including 4 different sizes, weighs only 430 grams, suitable for travel or home seasonal storage. ③. The bags protect your clothes from dust, mold, odors and moths. The reasonable magic design allows the air flow to work in only one direction, which maintains the vacuum for a long time. It fits well between the film and the sealing zipper, making it easier to seal. ④. Tip: Push the zipper back and forth 2 - 3 times to make it tighter. ⑤. For storing pillows, coats, cotton clothes, jeans and other heavy clothes: Medium size (40 * 50 cm * 3 pcs. and 40 * 60 cm * 3 pcs.). ⑥. For light clothes, including sweaters, shirts, short sleeves, etc.: Small size (35*50cm*3pcs). ⑦. For hair collection > 12pcs Travel Vacuum Bag Set 4 Sizes Bags. Material: PA + PE Material. ⑧. How to use the vacuum bag: - Open the double seal roll vacuum bag. - Put the folded clothes into the vacuum bags. - Pull the slider back and forth several times to confirm that it is sealed. - Start with the seal and squeeze it with your hand. Slide the zipper back and forth 2 - 3 times to make it tighter. ⑨. Package Contents: Vacuum Bag Travel Storage Bag (3 x 35*50cm, 3 x 40*50cm, 3 x 40*60cm, 3 x 50*70cm)