Face Mask Bag. This 100% cotton drawstring bag is an ideal size for face masks or for storing little knick-knacks around the home. Measuring 15cm wide by 20cm high and available in a range of colours they're rapidly increasing in popularity. The drawcord is made from the same cotton fabric as the bag itself. Due to the way in which cotton yarn is produced, occasional flecks of coloured thread may be seen in the finished cloth following the weaving process.