Mass Dynamic A4 C4 Large Letter Postal Boxes, 330x230x22mm Cardboard Shipping Boxes, Mailing Boxes for Royal Mail (Pack of 25)

• 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.

This durable corrugated kraft cardboard mailer is designed for strength and reliability, crafted from 1mm thick recycled material that resists pressure and creasing to protect your items in transit. Measuring 330 × 230 × 22 mm (external), it’s Royal Mail Large Letter compliant, lightweight (45–50g), and cost-efficient for shipping. With quick, easy assembly and smooth edges for a professional finish, it’s perfect for sending A4 documents, books, magazines, catalogs, and other slim items. 100% recyclable, this eco-friendly packaging provides a sustainable and versatile mailing solution.