Our comprehensive range of transit mail products include write on panels and easy to re-use flaps. Designed to deliver internal mail economically and efficiently.. - Flaps Closed. - Outside Seams. - Box Quantity: 250. - Pallet Quantity: 30,000. Features. Media weight. 90 g/m². Window. No. Product colour. Brown. Envelope format (ISO 269). C4 (229 x 324 mm). Weight & dimensions. Length. 229 mm. Width. 324 mm. General. Product family. Purely. Product series. Everyday