iSOUL A4 / A5 / A3 / A6 Board Backed Do Not Bend Envelopes — Pack of 10

iSOUL Board-Backed Do Not Bend Envelopes — Pack of 10

Protect documents, artwork, photographs and certificates in transit with these rigid-backed manila envelopes. A stiff card back keeps contents flat, while the pre-printed “Do Not Bend” notice on the front signals careful handling to postal workers and couriers.

Available sizes in this pack

• A3 / C3 — 457 × 324 mm
• A4 / C4 — 324 × 229 mm (holds an A4 sheet unfolded)
• A5 / C5 — 229 × 162 mm (holds an A4 sheet folded once)
• A6 / C6 — 149 × 105 mm

Each pack contains 10 envelopes of the size you select.

Features

• Hard board backing keeps contents rigid and flat in the post
• “Do Not Bend” pre-printed in the lower-left corner in red
• Peel & seal flap — no moisture or adhesive required; simply peel, press and close
• Classic manila colour suits both professional and personal correspondence
• Plastic-free packaging

Suitable for

Posting contracts, certificates, artwork, photographs, payslips, greetings cards, invitations and any flat document or item that must arrive uncreased.

Pack contents

10 × manila hard board-backed do not bend envelopes (size of your choice)

Also available: 20-pack  |  50-pack (best value)

FAQs

What size fits an A4 sheet flat?
The A4 / C4 variant (324 × 229 mm) holds a full A4 sheet without folding.

What size fits an A4 sheet folded in half?
The A5 / C5 variant (229 × 162 mm) accepts an A4 document folded once.

Are these suitable for Royal Mail large letter format?
The A4 / C4 envelope qualifies as a large letter with Royal Mail (subject to weight). The A5 / C5 also qualifies as a large letter for most standard contents.

Can I buy more packs?
Yes — also available as a 20-pack or a 50-pack for better value per envelope.