Supply Co. Clear Poly Mailer - 12" x 18" PreviousPoly Mailer - 19" x 24" NextClear Poly Mailer - 14" x 20" Clear Poly Mailer - 12" x 18" Clear Poly Mailer - 12" x 18" $35.00 1000 pieces per box.1 box minimum. Sold per case only. Quantity: Add To Cart Facebook0 Twitter LinkedIn0 Reddit Tumblr Pinterest0 Qty of 500 pcs.