Full-Colour Personalised Capacity Book Mailers

Send your items securely and in style with our custom printed capacity book mailers – lightweight, letterbox-friendly, and built to protect documents, prints, books, stationery and other flat or slim products in transit. These strong mailers give your packaging a professional branded finish, helping your parcels arrive safely while keeping postage costs under control.

Manufactured from durable corrugated board, capacity book mailers are designed to hold contents snugly and reduce movement during delivery. Their clever capacity style offers extra protection for items with depth, while still staying within Royal Mail’s Large Letter size criteria where applicable. Supplied flat-packed, they assemble quickly and make day-to-day fulfilment faster and tidier.

• Vibrant full-colour print: Add your logo, artwork or messaging in sharp digital colour to make every mailer instantly recognisable.
• 5-star rated quality: Trusted by businesses for consistent protection and premium print results.
• Printed proof & satisfaction guarantee: Approve a full printed sample of your capacity book mailer before we go into full production.*
  *Please note this excludes printed single sample orders.
• Fast turnaround: Printed and delivered in as little as a few days to keep your dispatch running smoothly.
• UK made & printed: Both manufactured and printed in the UK, helping reduce transport mileage and carbon footprint.
• FSC® certified materials: Produced using responsibly sourced board with 60%–90% recycled content.
• Royal Mail Large Letter friendly: Designed to meet Large Letter size criteria and fit through most standard letterboxes – reducing failed deliveries and improving customer convenience.
• Protective corrugated build: Lightweight yet rigid construction helps prevent bending, creasing and impact damage in transit.
• Simple size guidance: Capacity book mailer sizes shown are internal dimensions listed as Width x Length.

Considering a printed sample?

We offer an optional printed sample so you can confirm colour quality, print sharpness and suitability before ordering in larger quantities. When you proceed with a full order of the same design, we will refund the cost of the sample.

Please note: Minor branding or barcodes may appear on the capacity book mailer. Images shown are for guidance only and the supplied product may differ slightly.

Due to manufacturing tolerances, actual item dimensions may vary by 10–20mm. If sizing accuracy is essential, we recommend ordering a sample before placing a larger order.

Authentic Product Photography

All images displayed on Parcelsend UK represent genuine printed jobs we have produced. No visuals on this page are created or enhanced using AI - every photograph is taken from real customer orders to give you an honest representation of print quality and finish.

Because we use an on-demand, instant digital full-colour print system, we’re able to offer some of the lowest minimum order quantities in the UK - perfect for small runs or custom projects.

Please note: a one-time low-volume set-up fee of £49.95 applies to any order under £100. This is added automatically at checkout, but it won’t apply to repeat orders of the same product as long as the artwork remains unchanged.

All of our products are manufactured and dispatched right here in our own UK warehouse, which means we can offer some of the fastest turnaround times in the country. And because everything is produced in the UK (unlike many other providers), you’ll never have to worry about customs delays or surprise charges. Delivery is calculated at checkout based on order value - free over £70. All orders are shipped flat-packed for maximum efficiency.

100% Risk-Free Satisfaction Guarantee - We want you to feel totally confident when ordering with us. Before full production starts, you’ll get a proof (by app or email) and can make as many changes as you need until you’re completely happy. If you’d like to check our quality first, you can order a sample directly from the product page. Proofs aren’t provided with samples since they’re just for testing print and quality, but when you place your full order, you’ll be able to make amendments then. The cost of your sample will be refunded against your first full order*, and if you’re not happy with the quality, we’ll refund you in full.

*Sample refunds can’t be combined with other discounts or promotions.