Medium Acid-free Storage Box for Linens, Quilts, Keepsakes, 2 PACK A new size, medium-Measures: 5 by 18 by 15 inches Includes: 24 sheets of unbuffered acid free tissue paper Also includes dessicant. Acid-free sheets are 20 by 30 Sulfur, acid and lignin free. 3% calcium carbonate buffer 200 lb test blue/gray corrugated with double wall sides and bottom.