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Cardboard Envelopes
Cardboard envelopes are the practical middle ground between a standard envelope and a full despatch box — rigid enough to protect flat or slim items in transit, compact enough to keep postage costs low. Whether you're sending important documents that must arrive flat, photos and prints, or lightweight ecommerce orders, there's a cardboard envelope in our range to suit.
Our range covers board backed envelopes, all board envelopes, do not bend envelopes, corrugated cardboard envelopes, and Mailjacket cardboard mailers — all with peel-and-seal closures and available in popular sizes including C3, C4, C5, A4, and A5.
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About Cardboard Envelopes
Which cardboard envelope do you need?
Board backed envelopes
are the standard choice for documents, photos, and certificates that need to stay flat. Available in manilla and white, in C4, C5, and A4 sizes, they're ideal for anything where a crease or fold would cause real damage. For particularly important items, choose the pre-printed "do not bend" option, which is popular for certificates, artwork prints, photographs, and legal documents. Our board backed envelopes range covers all the popular sizes and finishes.
All board envelopes
offer more rigidity than standard board backed options, made from high-grade 350gsm GD2 fully coated chipboard. A good choice where you need a premium feel alongside reliable protection — popular for sending photos, prints, and higher-value documents.
ColomPac corrugated cardboard envelopes
are rigid, expandable corrugated mailers that can open up to 40mm in depth — ideal for slim but slightly bulky items that need a sturdier outer than a flat envelope can provide. Known for superior quality and consistent performance.
Mailjacket cardboard mailers
are a low-cost, lightweight option modelled on the Amazon-style envelope format. Made from 100% recycled 400gsm cardboard, they offer solid protection for everyday ecommerce despatch at a price point suited to high volume.
Cardboard envelopes and Royal Mail sizing
Most cardboard envelopes are designed to sit within Royal Mail's large letter or small parcel size bands — making them a cost-effective alternative to boxes for flatter items. Getting the dimensions right before you buy can make a meaningful difference to per-item postage costs. Our Royal Mail size guide covers the exact thresholds for each band.
Not sure which option is right for your product? Our guide to choosing the right cardboard envelope covers each format in detail.
Frequently Asked Questions
Which cardboard envelope do you need?
Board backed envelopes are the standard choice for documents, photos, and certificates that need to stay flat. Available in manilla and white, in C4 and C5 sizes, with pre-printed "do not bend" options for anything particularly important. Our board backed envelopes range covers all the popular sizes.
What options are available in the Cardboard Envelopes range?
Our range covers board backed envelopes, all board envelopes, do not bend envelopes, corrugated cardboard envelopes, and Mailjacket cardboard mailers — all with peel-and-seal closures and available in popular sizes including C4, C5, A4, and A5.
What materials are used for Cardboard Envelopes?
Made from 100% recycled 400gsm cardboard, they offer solid protection for everyday ecommerce despatch at a price point suited to high volume.
What are the uses of Cardboard Envelopes?
ColomPac corrugated cardboard envelopes are rigid, expandable corrugated mailers that can open up to 40mm in depth — ideal for slim but slightly bulky items that need a sturdier outer than a flat envelope can provide.
What can I find in the Cardboard Envelopes category?
Cardboard envelopes are the practical middle ground between a standard envelope and a full despatch box — rigid enough to protect flat or slim items in transit, compact enough to keep postage costs low. Whether you're sending important documents that must arrive flat, photos and prints, or lightweight ecommerce orders, there's a cardboard envelope in our range to suit.