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Cardboard Mailers
Cardboard mailers are a practical, lightweight alternative to boxes for sending flat or slim items through the post. Sturdier than a padded envelope, more compact than a full despatch box — they protect your products in transit without the bulk, and keep your postage costs down by fitting within Royal Mail's smaller size bands.
Our range covers three distinct styles to suit different products, budgets, and sustainability priorities. All are fully recyclable, plastic-free, and made from corrugated cardboard.
Which cardboard mailer is right for you?
Priory Elements EcoMailers™ are made from sustainably sourced corrugated cardboard, with 1% of every sale donated to environmental charities worldwide through our partnership with 1% For The Planet — at no extra cost to you. A straightforward way to make your packaging do more than just protect the product.
ColomPac cardboard mailers offer full scope 1, 2, and 3 carbon offset, covering manufacturing, distribution, and end-of-life recovery. For ecommerce brands with formal sustainability commitments or carbon reduction targets, these are the strongest option in the range.
Mailjacket mailers are a low-cost, high-performance option for businesses where unit cost is the priority. Made from 400gsm cardboard using 100% post-consumer waste, they offer solid protection for lightweight items at a price point that suits high-volume despatch.
Not sure which style suits your product? Our cardboard mailer guide covers how to choose the right option and measure correctly.
Cardboard mailers and Royal Mail sizing
One of the main advantages of cardboard mailers over boxes is the ability to keep postage costs low by hitting Royal Mail's large letter or small parcel thresholds. Getting your dimensions right before you buy can make a significant difference per item at volume. Our Royal Mail size guide sets out the exact thresholds for each size band.
For items that must not be bent in transit, our do not bend envelopes and board backed envelopes are worth considering alongside cardboard mailers. Or book wraps if you need a wrap-around solution for books, games, or similarly rigid flat items.
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