From standard Board Backed Envelopes right through to the ultimate Rigid All Board Envelopes from ColomPac, we’re confident that we can help you find the best cardboard mailer for sending your products. We’ve created this guide to ensure you can easily find the perfect cardboard envelope for your needs.
At A Glance
| Grade | Strength | Choose When | Eco Score |
| Board Backed Envelopes |  |
You want a low-cost solution that will prevent your items bending in the post. |  |
| MailJackets |  |
You want a mailer that will fit snugly around your items and keep postal costs low. | |
| Priory Elements EcoMailers |  |
You need to send lightweight, non-fragile products and minimise postal costs whilst reducing your impact on the environment. |  |
| All Board Envelopes | |
You’re looking for a premium grade envelope that will fully protect your documents during transit. | |
| Rigid All Board Envelopes |  |
You need the ultimate protective postal packaging solution for your documents – ensuring they arrive safely with your customers. |  |
Postage Guide
📮 Royal Mail Size Guide
Large letter, small parcel, medium parcel — size thresholds, weight limits & how to avoid overpaying on postage.
Board Backed Envelopes
If you’re sending important documents which need to be kept flat, our Board Backed Envelopes have a paper front with a rigid cardboard backing to ensure items don’t bend in the post. Available in white and manilla and printed with ‘Please Do Not Bend’, these envelopes are a lower cost alternative to our fully cardboard options and provide excellent protection.
MailJacket ™
MailJackets™ have a peel and seal closure, smooth card interior and a tear open strip for easy opening for your customer – no tape, complex folding or hassle required. If you need a combination of fast packing, reduced postage costs and excellent in-transit protection, MailJackets will be the best choice for you.
Priory Elements EcoMailers™
Our Priory Elements EcoMailers are a 350gsm cardboard mailer that helps keep postal costs low whilst reducing impact on the environment. Made from 100% post-consumer waste and 0% plastic, they are biodegradable, recyclable and planet friendly. To help emphasise your eco message, our EcoMailers are printed with easy to understand eco-markers, and each size is assigned an endangered animal; this acts as a helpful size guide as well as demonstrating your commitment to protecting our planet. Stocked in 4 popular sizes, we’re certain our EcoMailers will work for you.
All Board Envelopes
These All Board Cardboard Envelopes are made from premium grade fully coated white lined chip board to offer all round protection and great presentation. Choose All Board Envelopes if you need to keep your products and documents safe and presentable during postage – we’ve got a wide range of sizes to suit all needs.
Rigid All Board Envelopes
ColomPac® Rigid All Board Envelopes are the strongest envelopes in our range, offering the ultimate level of protection to items to ensure they arrive in perfect condition. Reinforced edges and corners ensure items arrive neatly presented, peel and seal closure keeps packing fast, and an easy open strip gives your customer a frustration free experience when opening. Choose Rigid All Board Envelopes when you need maximum in-transit protection.
Ask The Experts
We hope the above advice gives you all the help you need to choose the right style of cardboard envelope for your needs. eCommerce despatch operations are our speciality so if you have any unanswered questions or require further assistance then please get in touch – we’ll be more than happy to help.