PayPal Logo

Size 4 - Brown All Board Envelopes / Capacity Book Mailers - 278mm x 400mm

  • Size 4 - Brown All Board Envelopes / Capacity Book Mailers - 278mm x 400mm
  • Product Code: ABB-4#
  • £0.00

FREE SHIPPING on orders over £30 (ex VAT) to Most UK Mainland Addresses
Orders placed after 3.00 pm may not be shipped on the same day

Available Options



Strong 400 gsm Size 4 Capacity Book Mailers / All Board Brown Envelopes in a C4+ version for A4+ Documents & Books


Our size 4 capacity book mailers are an extremely strong all board brown envelope equating to C4+ size & providing superb protection for contents you want particularly well protected.

They are very popular with traditional users of C4+ A4+ board backed envelopes that want additional strength for their mailings.


C4+ / A4+ Brown All Board Envelopes / Capacity Book Mailer Details


Size: 400mm x 278mm (Accommodates Oversized A4 documents)

Envelope Style: Wallet

Board Grade: 400gsm

Closure: Peel & Seal with red ripper strip

Individual Capacity Book Mailer Weight: 115g (appx)

Postal Band: Small Parcel

Environmental Information

All of our brown all board envelopes / capacity book mailers are produced from 100% recyclable material.


Shipping Rates & Upgrades


FREE SHIPPING ON ORDERS OVER £30 (ex VAT)...
so no nasty surprises at checkout.

With the vast majority of items listed on this site being supplied without an additional charge for postage on orders over £30 NET .

The only time you may have additional charges is when you’re buying bulk quantities, very large items or you’re located offshore or in certain parts of the Scottish Highlands.

Please note that we cannot deliver to PO boxes.

Please check here for Offshore and Scottish Highlands shipping upgrades

If you require a faster delivery, click here for timed shipping upgrades

If you are ordering outside of the UK, please click here to see our international rates