Arpan 457mm x 324mm A3 C3 Manilla Hard Board Backed Envelopes Do Not Bend (Pack of 100)

STRONG A3 HARDBOARD PROTECTION: Keep important items safe with rigid A3 hardboard backing designed to prevent bending in transit. Ideal for artwork, prints, certificates, photos and documents that must stay flat and secure during postage or storage. CLEAR “DO NOT BEND” MESSAGE: Each envelope features a bold printed message to alert handlers and ensure careful delivery. Perfect for sending valuable items where shape and condition are essential, helping to reduce damage while improving reliability. SECURE SELF-SEAL STRIP: A strong self-seal strip gives fast, clean and secure closure with no tape needed. This makes packing simple and efficient for homes, offices, schools and small businesses posting multiple A3 items every day. DURABLE MANILLA CARD DESIGN: Made from high-quality manilla card and reinforced with a firm board, these envelopes offer excellent rigidity while remaining lightweight. They provide great protection without increasing postage costs unnecessarily. ECO-FRIENDLY & LABEL-READY: Crafted from recycled materials, these envelopes are an environmentally conscious choice. Smooth surfaces allow easy writing or sticking address labels, making them ideal for professional and personal mailing needs.