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Durable & Strong: Made from high-quality 1mm thick corrugated kraft cardboard, resistant to pressure and creasing for secure protection. Royal Mail Large Letter Compliant: External size approx. 330 × 230 × 22 mm (internal 320 × 225 × 20 mm), weight ~45–50g, designed to qualify as Large Letter. Easy Assembly: Quick to fold and set up in seconds, sealable with tape, featuring smooth edges for a professional look. Eco-Friendly Material: Manufactured from recycled cardboard and fully recyclable, making it a sustainable packaging choice. Versatile Use: Perfect for mailing or storing A4 documents, magazines, catalogs, books, or other slim items.