"Do Not Bend" Board Back Envelopes

“Do Not Bend” Board Back Envelopes at Triplast

At Triplast, we supply high-quality board backed envelopes that are clearly printed with “Do Not Bend” — the ideal choice for protecting important documents in the post. Whether you’re sending certificates, photographs, or contracts, our hard board back manila envelopes provide the rigidity and reliability needed for safe delivery.

Stiff & Durable Construction

Each envelope features a durable hard board back and strong paper front, ensuring items remain flat and crease-free during transit. Designed to withstand handling pressure, these board backed do not bend envelopes are trusted by professionals, creatives, and eCommerce sellers across the UK.

From A5 board back do not bend envelopes to larger sizes, Triplast offers a range tailored to suit letters, prints, and more delicate items. For bulk orders, our do not bend envelopes in bulk are a cost-effective option for businesses shipping frequently.

Perfect for Business & Personal Use

Our do not bend board backed envelopes are widely used in offices, mailing centres, and creative industries. They’re a must-have for sending important flat items securely — from legal documents to artwork — and are even a trusted alternative to hard board back manila envelopes from China or other generic imports.

Eco-Friendly & Recyclable

All Triplast board backed envelopes are made using recyclable materials, helping you meet your sustainability goals while maintaining top-tier packaging standards.

Fast Delivery & Bulk Availability

Whether you need a few please do not bend board backed envelopes or wholesale quantities, we provide competitive prices and fast UK-wide delivery. Browse our selection online — including A5 hard board back envelopes and more — and enjoy dependable packaging from Triplast.