For a cleaner postal presentation
White cardboard envelopes protect flat items such as documents, artwork, posters and books in the post, with a clean white finish. The 350 gsm solid board resists punctures and tearing, keeping contents flat and supported in transit. Contents load through a short edge opening, and an adhesive strip seals the flap without extra tape. A built-in tear-off strip lets the recipient open the envelope cleanly without cutting into the contents. It stays lightweight for its rigidity, so it protects without adding much postage. These C4 white board-backed envelopes come in a range of sizes, from 162 x 229mm and 250 x 352mm up to 324 x 450mm, plus a wide-format 625 x 444mm option (opening width x internal height).
Sold and priced per pack.
Where do white cardboard envelopes work best?
White cardboard envelopes suit postal and courier despatch where flat items need firm, lightweight board support and a clean white finish.
- Business documents such as contracts, certificates and reports, kept flat and protected from bending and tearing.
- Artwork and prints, where the 350 gsm solid board shields flat creative work from punctures in transit.
- Posters and slim rigid items, where the short edge opening makes loading straightforward.
- Books and catalogues, where board gives more structure than a paper alternative while keeping the pack light.
Not for
- Bulky or deep products. Use cardboard boxes when contents need depth or corner protection.
- Soft, impact-sensitive items. Use a padded envelope when cushioning matters more than flat board.
- Waterproof mailing. Use a plastic alternative such as our grey mailing bag when the outer needs to resist moisture.
Specifications
- Colour: white
- Material: cardboard
- Board weight: 350 gsm
- Closure: adhesive tape strip, no extra tape needed
- Opening: short edge opening
- Opening feature: tear-off strip
- Sizes: 162 x 229mm, 250 x 352mm, 324 x 450mm, 625 x 444mm (opening width x internal height)
- Supplied: sold and priced per pack
Choose the right cardboard envelope
White large letter cardboard envelopes are built to keep flat items rigid with a clean white finish.
- Choose white cardboard envelopes for a 350 gsm solid board mailer with a short edge opening, adhesive seal and tear-off strip, in white.
- Choose Do Not Bend envelopes when you want a brown finish with a pre-printed 'PLEASE DO NOT BEND' warning.
- Choose cardboard mailing envelopes when you need an expandable carton that adjusts up to 40mm for slightly thicker items.
FAQs
Do these envelopes need extra tape?
No. The built-in adhesive tape strip seals the flap without any additional tape.
Are they suitable for important documents?
Yes. The 350 gsm solid board gives flat documents more protection than a standard envelope in the post.
Can recipients open them without scissors?
Yes. The tear-off strip opens the envelope cleanly, without cutting into the contents.
What items fit best?
Flat items such as documents, artwork, posters, brochures and books.
Also useful
