Send important documents securely with the U. Mail® Board Back Envelopes, designed to keep paperwork flat and protected during mailing. Measuring 229 x 324mm, these large envelopes are ideal for sending A4 documents, certificates, photographs, and important paperwork without folding. The sturdy board-backed design helps prevent bending and creasing, making them a reliable choice for both personal and professional use. Supplied in a great value pack of 3, these envelopes are perfect for everyday mailing tasks in the home office, workplace, or business environment. Whether posting documents, sending files, or organising outgoing mail, the U. Mail® board back envelopes provide a practical and dependable mailing solution. Key Features Large 229 x 324mm Size – Ideal for sending A4 documents, certificates, and important paperwork. Board Back Design – Rigid backing helps protect contents from bending or creasing. 3 Pack Envelopes – Convenient value pack suitable for everyday mailing needs. Secure Document Posting – Helps keep paperwork flat and protected during delivery. Office & Home Use – Perfect for home offices, businesses, schools, and general mailing tasks.