Vacuum bag can be used to store bulky items like quilt, coats, sweaters, pillows, comforters, etc. Besides space saving, Vacuum storage bag has other important benefits as well. With airtight and waterproof performances, it keeps out bugs, dirt, moisture, mildew, bacteria, musty odors and discoloration. So it is also used to store important files, family albums, Video Discs, and silver jewelry. The material is: PA + PE