Quilt cotton fabric...  these fabrics have been washed. 
 
Actual product color may vary from the images shown. Every monitor or mobile display has a different capability to display colors, and every individual may see these colors differently. In addition, lighting conditions at the time the photo was taken can also affect an image's color. Stock photos are used with some fabrics.

Based on regular weight cotton: 1 yard is 6 oz. First Class, 2 yards is 12 oz. First Class. The priority flat rate envelope holds up to 4 yards. The flat rate bubble envelope holds up to 8 yards. The medium flat rate box holds up to 23 yards. The large flat rate box holds up to 32-33 yards.