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These protective postal boxes have dimensions of 322x229x20mm, allowing it to be sent as a Large Letter through Royal Mail. Offering an easy assembly with an integrated locking tab and pre folded creases, these cost-effective white postal boxes are perfect for securely sending your lightweight items. Features include: Suitable for A4 items Made from 75% recycled single wall board Straightforward to assemble Recyclable, reusable and degradable Sized to ensure low postal costs Supplied flat packed