Printed PLEASE DO NOT BEND
Card backed do not bend envelopes keep flat documents rigid in the post, so photographs, certificates and printed items arrive uncreased. A 600 gsm solid board back resists bending, creasing and tearing. The 120 gsm brown paper front carries a red PLEASE DO NOT BEND warning, telling handlers to keep the envelope flat. A self-seal adhesive strip closes each one quickly without tape. Six sizes run from 144 x 162mm up to 324 x 457mm, covering mail formats; C6, C5, do not bend envelopes A4 and C4 board backed envelopes. The board is 100% recyclable, and packs arrive sealed in cardboard boxes to keep them clean.
Sold in packs of 50 or 125 depending on size, priced per pack.
Where do card backed envelopes 'Do Not Bend' work best?
These do not bend envelopes A4 suit post rooms and e-commerce benches sending flat items that must not crease.
- Posting photographs and artwork, where the 600 gsm board keeps prints flat through sorting and delivery.
- Sending certificates, documents and files, where board support prevents creasing and tearing in transit.
- Mailing cards, magazines and paperwork as do not bend A4 envelopes, where the printed red PLEASE DO NOT BEND warning flags the contents to handlers.
- Office and mailroom despatch, where a self-seal strip closes each envelope quickly at volume.
Not for
- Bulky or deep items that need side protection. Use cardboard boxes for products with depth or corners.
- Heavy contents that shift inside a flat pack. Use a rigid postal box for containment.
- Items needing moisture resistance. Use a grey mailing bag where a waterproof outer material matters.
Specifications
- Colour: brown
- Board back: 600 gsm solid board
- Paper front: 120 gsm brown paper
- Printed warning: PLEASE DO NOT BEND, in red
- Closure: self-seal adhesive strip
- Size range: 144 x 162mm, 178 x 241mm, 229 x 162mm, 229 x 324mm, 368 x 444mm, 324 x 457mm (internal opening x height)
- Pack quantity: 50, 125 or 250 depending on size
- Recyclability: 100% recyclable
Choose the right envelope
These envelopes with 'Do Not Bend' messaging are built to keep flat documents rigid rather than to add depth.
- Choose these brown mailer envelopes for A4, C4 and smaller flat documents. They have a 600 gsm board back and a printed "PLEASE DO NOT BEND" warning.
- Choose white cardboard envelopes when a white finish suits the mailing better than this brown board back.
- Choose tamper proof envelopes when returns or reuse call for a locking-flap closure rather than this self-seal strip.
- Choose an expandable cardboard envelope for larger, bulkier items which require an expandable format.
FAQs
Are these suitable for A4 documents?
Yes. Choose a size that fits A4 flat, without folding. The range runs up to 324 x 457mm, covering A4 and larger.
Do they show a handling instruction?
Yes. Each envelope is printed with PLEASE DO NOT BEND in red, instructing handlers to keep it flat in the post.
Do you offer C4 board backed envelopes?
Yes. The six sizes include C4 board backed envelopes, up to a maximum internal opening of 324 x 457mm.
Do I need tape to close them?
No. Each envelope has a self-seal adhesive strip, so orders close without separate tape.
Are they recyclable?
Yes. The envelopes are 100% recyclable.
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