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Large Letter Cardboard Boxes are perfect for keeping your postal costs to a minimum by complying with Royal Mail sizing to deliver the best possible value to you. Our range of large letter cardboard boxes comprises three of our postage-in-proportion, or PIP, cardboard postal boxes, which are available in A6, A5, and A4 sizes and up to 20mm in depth to suit your requirements for whatever you’re sending. These cardboard postal boxes are made from a robust corrugated cardboard for extra rigidity and follow a standard 0427 design; folding to assemble and using the integrated locking tabs to help prevent crushing, and then tape shut for enhanced security during transit.
