Our 218mm x 159mm x 20mm brown postal boxes are ideal for efficiently, effectively sending your medium sized, lightweight items. Offering quick and easy assembly, these postal boxes are designed to fit inside Royal Mail’s Large Letter sizing to reduce postage costs. Made from high quality single wall board, our brown postal boxes are supplied flat packed in bundles of 50 boxes to ensure easy storage and handling. Features: Royal mail large letter sized Made from recycled materials, recyclable and reusable Supplied flat packed in bundles Fefco style 0421 + locking tab