-12 1/8" x 9 1/8" x 2" (1/2" or 1") -Perforated for easy folding -Holds 1 - 4 Books, Albums or other items -Perforated at multiple depths for flexibility - one mailer makes multiple sizes. Adjusts to close at 1/2" or 1" -Manufactured from heavy-duty 200#/ECT-32-B flute corrugated. -Color: White