10 x A4 C4 Manilla Hard Board Back Envelopes – Rigid & Secure Do Not Bend Mailers
Introduction:
This pack of 10 A4 C4 Manilla Hard Board Back Envelopes is designed to safeguard important documents, certificates, photos, and reports during mailing. Featuring a rigid hardboard back and a durable kraft paper front, these envelopes ensure contents remain flat and undamaged. The peel & seal closure provides a secure, hassle-free seal, while the "Do Not Bend" warning guarantees careful handling.
Key Benefits:
- Rigid protection – prevents bending and creasing of documents.
- Peel & seal closure – secure and easy to use.
- Eco-friendly material – 100% recyclable & biodegradable.
- Lightweight & cost-effective – saves on postage costs.
- Multipurpose use – suitable for home, office, and business mailing needs.

Why Choose A4 C4 Manilla Hard Board Back Envelopes?
- Strong & durable – 120gsm kraft paper with 1000-micron hardboard back.
- Tamper-resistant self-seal – no need for glue or tape.
- "Do Not Bend" printed warning – ensures careful handling.
- Perfect fit for A4 documents – keeps contents flat and crease-free.
- Sustainable choice – plastic-free, recyclable, and biodegradable.
Applications:
- Mailing A4 documents, certificates, and artwork.
- Shipping reports, contracts, and legal papers.
- Storing photographs, portfolios, and magazines.
- Ideal for home, office, and business use.
- Safe packaging for important paperwork.

Specifications:
Feature | Details |
---|
Material | Kraft Paper & Hard Board |
Closure Type | Peel & Seal |
Color | Brown |
Size | C4 (324x229mm) |
Paper Thickness | 120gsm (front) & 1000-micron board (back) |
Recyclable | Yes, 100% biodegradable |
Quantity | 10-pack |
Pre-Printed Warning | "Do Not Bend" in red font |
FAQs:
Q: Can these envelopes fit A4-sized documents without folding?
A: Yes, they are designed for A4 documents unfolded and A3 documents folded in half.
Q: Are these envelopes rigid enough to protect fragile papers?
A: Yes, the hardboard back prevents bending, keeping contents secure.
Q: How do I seal these envelopes?
A: Simply peel off the adhesive strip and press the flap down for a strong, tamper-proof seal.
Q: Are these envelopes environmentally friendly?
A: Yes, they are made from 100% recycled, biodegradable materials.
Q: Can I write directly on these envelopes?
A: Yes, the kraft paper front allows easy writing, eliminating the need for labels.