Manilla Rigid Corrugated Board Mailers

Durable 400gsm Corrugated Board Material

Eco Kraft Finish

Peel and Seal Closure

Popular Post Solution

Size Guide

Here’s a handy list of the most common C sizes and how they relate to A paper sizing.

Please note that all our product sizing refers to the is internal measurement of the envelope.

C Name	Size (mm)	Paper Size
C0	917 x 1297	A0
C1	648 x 917	A1
C2	458 x 648	A2
C3	324 x 458	A3
C4	229 x 324	A4, A3 folded in half
C5	162 x 229	A5, A4 folded in half
C6	114 x 162	A6, A4 folded in four parts
C7	81 x 113	A7, A5 folded in four parts
C8	57 x 81	A8
C9	40 x 57	A9
C10	28 x 40	A10

Still Need Help? Read our comprehensive guide to envelope sizes, closures and the types of envelopes you can buy.

Your Complete Guide to Envelope Sizes, Types & Closures

Alternatively get in touch with one of the team at sales@postalpackaging.com and we'll be happy to help.

Choose Size

180 x 235mm

194 x 292mm

234 x 334mm

248 x 345mm

255 x 345mm

278 x 400mm

321 x 467mm

370 x 340mm

Square - 180 x 180mm

Product Code: CFM180235M ISBN: 8435605307735

Wholesale +

and

Klarna

Pay in 3 Available*

Custom Printing Available > Personalised Designs with Fast Turnaround

Our corrugated mailers are expertly designed to withstand handling and potential damage during transit. With a strong 400gsm corrugated board forming a resilient barrier safeguarding you items while in the post.

Hear from Our Customers

See why we’re trusted as the UK’s go-to for packaging and envelopes from verified Trustpilot reviews.

BeverleyTrustpilot Review

A proper online shop, just what you want, easy to find, easy to use. I didn't jump here first but now wish I had for sure. Prices are excellent too, am delighted with the professional finish and will recommend and use from now on.

EmmaTrustpilot Review

Really excellent friendly customer service and product (biodegradable transparent bags) is first class. Delivery super speedy. Highly recommended. Thank you

RichardTrustpilot Review

I purchased some flat pack cartons but was unsure how to assemble them. I sent an email asking for help & promptly, a very helpful young lady created an extremely helpful, bespoke video for me to show how to do it.

GailTrustpilot Review

Very simple website to use, good quality, well packed
and very quick.

KateTrustpilot Review

Easy to use website and fast delivery

JohnTrustpilot Review

Great and fast delivery, thank you!

Who Are Postal Packaging?

Postal Packaging are a UK based packaging supplier providing sustainable, premium packaging solutions for every size of business. With over 20 years’ experience and industry specific product knowledge our specialist team can deliver a value-added service to all our customers in the UK marketplace. Our centralised warehouse facilities in Wales stocks a wide range of diverse packaging products ranging from Capacity Book Mailers, Board Back envelopes, Kraft Corrugated Bags and much more in addition to offering a bespoke design and printing service. Our products offer perfect postal protection for transit ensuring your items are received securely by your customers.

Manilla Rigid Corrugated Board Mailers

Hear from Our Customers

Who Are Postal Packaging?

Get In Touch

Customer Service

More From Us

Supported payment methods

Manilla Rigid Corrugated Board Mailers

Hear from Our Customers

Free Shipping On Your First Order*

Who Are Postal Packaging?

Get In Touch

Customer Service

More From Us

Supported payment methods