Send your important documents with confidence using A5+ Premail  Board Backed Envelopes – designed to prevent bending, creasing, or damage during transit. Each envelope features a sturdy, rigid cardboard backing and a strong paper front for a professional finish. The peel-and-seal closure ensures secure mailing, while the A5+ size is perfect for certificates, photos, invitations, and other valuable flat items. Ideal for business, office, or personal use, these envelopes combine durability with a neat, professional appearance for reliable postal protection.