Sending Certificates, Legal Papers, and Artwork Safely with Do Not Bend Envelopes
Post certificates, legal originals, and artwork with confidence using the right envelope and technique.
Posting certificates
Certificates including academic diplomas, professional qualifications, and awards are often irreplaceable originals. They need rigid protection to prevent bending, creasing, and moisture damage during posting.
Quick answer
Use a 600gsm+ board-backed C4 envelope for A4 certificates, wrap in acid-free tissue or cellophane, and seal with peel-and-seal. For legal documents, add tracked delivery for proof of posting. For artwork, add backing card on both sides. All three benefit from clear DO NOT BEND printing on the exterior and careful size selection that leaves clearance without excess space.
Legal documents
Proof of posting protects both sender and recipient in legal matters.
Peel-and-seal shows if the envelope has been opened.
Loose pages shift and can catch on the seal during opening.
Artwork and prints
Fine art prints and photographs are the most damage-sensitive items posted in do not bend envelopes. Use the highest board weight (600-700gsm), wrap in acid-free tissue, add backing card on both sides for valuable originals, and use cellophane sleeves for moisture protection.
Artist tips: photographer guide or sizing guide.
Universal tips
Safe posting checklist0 / 5 checked
Envelopes for important documents
Board-backed envelopes for certificates, legal papers, and artwork from ProcuraPack.
Browse do not bend envelopesFrequently asked questions
600gsm+ for irreplaceable originals. 400gsm for standard certificates.
For legal documents and valuable originals, yes. Proof of posting provides legal protection.
Cellophane sleeve prevents the embossed elements from being flattened or marked.
No, A3 requires C3 envelopes which exceed large letter dimensions. Ships as small parcel.
Yes, backing card on both sides provides maximum protection for valuable originals.
Part of our guide
Product Guide: Do Not Bend Envelopes
Expert guides on rigid mailers and board-backed envelopes for protecting documents, prints, and certificates.
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