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Our large letter postal boxes are specially designed to comply with Royal Mail's PIP postal guidelines. These boxes are ideal for sending smaller items and easily fit through mail boxes, meaning there is no need to worry about missed deliveries. Large letter packages minimise postal costs, and are an economic way to send your products without compromising on the protection and strength.- Quick to assemble and fill- Supplied flat for convenient storage- Easy to open and looks great when delivered - Dimensions are internal sizes to ensure they meet the Royal Mail Large Letter size 353x250x25 (ext)