Description
Our A4 book mailer pack of 25 takes items up to 209 x 312mm and 40mm deep, folding from a 248 x 345mm flat blank in 400gsm micro F-flute corrugated board. A peel-and-seal strip closes each mailer.
Same product, other pack sizes: pack of 10, box of 100. Book mailers are corrugated and wrap to the depth of the item, so they protect corners better than a flat cardboard envelope.

A4 book mailer pack of 25: specifications
| Flat size | 248 x 345mm |
|---|---|
| Inside space | 209 x 312 x 40mm |
| Fits | A4 books, workbooks, catalogues |
| Board | 400gsm corrugated, micro F-flute |
| Closure | Peel-and-seal strip |
| Pack quantity | 25 |
| Royal Mail | Large Letter if the packed mailer is no thicker than 25mm and no heavier than 750g; deeper items post as a Small Parcel |
Good for: Books, workbooks, calendars and catalogues for independent sellers and publishers.
Which book mailer size do I need?
Pick the mailer whose inside space is a little bigger than your book; the corrugated wrap adjusts to the depth. Sizes in stock:
- A4 book mailer: 248 x 345mm flat, 209 x 312 x 40mm inside
- Large book mailer: 278 x 400mm, fits A4 files and large books
See the full range in corrugated book mailers.
Buying for a business, school or production?
We supply publishers, bookshops, schools, universities and online sellers. If you order this regularly, contact us to ask about trade pricing.
A4 book mailer pack of 25 FAQs
What fits inside?
Items up to 209 x 312mm and about 40mm deep.
Is there a bigger pack?
Yes, a box of 100, and a pack of 10 to try the size.
Is it a Large Letter?
Only when packed to 25mm thick or less and 750g or less.





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