THESE FLAT BOXES MEET THE ROYAL MAIL LARGE LETTER 25MM CRITERIA
Description: Manufactured from single wall E flute corrugated board, with a kraft finish. Two shaped tabs that slot-lock into the 20mm side of the box for final closure. All delivered flat packed for easy space saving storage.
Size: 320x230x20mm (12.59×9.05×0.8″) – C4
L x W x H (internal dimensions)
Usage: For transportation of goods in the postal system within Royal Mail PIP limitations.