{"product_id":"custom-printed-large-letter-postal-boxes","title":"Customised Printed Large Letter Postal Boxes","description":"\u003ch2 class=\"producth2\"\u003eFull-Colour Personalised Royal Mail Large Letter Postal Boxes\u003c\/h2\u003e\n\u003cp\u003eMaximise brand visibility while minimising postage costs with our custom printed Large Letter postal boxes. Designed to meet Royal Mail’s Large Letter sizing rules, these slimline boxes are perfect for e-commerce orders, subscription kits, literature packs, and flatter retail items that need secure, professional packaging without tipping into higher postage bands.\u003c\/p\u003e\n\u003cp\u003eManufactured from rigid single wall corrugated cardboard with a smooth kraft surface, they offer reliable protection while keeping weight low for cost-effective shipping. Choose between a natural brown kraft finish or a clean white outer - both ideal for presenting your branding at its best from the moment your parcel lands.\u003c\/p\u003e\n\u003cp\u003eEvery box is supplied flat-packed to save storage space and assembles quickly with strong folding tabs and flaps. With vibrant full-colour digital print and UK-based manufacturing, you get a fast, premium packaging solution that reinforces your brand and delivers a standout unboxing experience.\u003c\/p\u003e\n\u003cul class=\"productbullets\"\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eVibrant full-colour print:\u003c\/span\u003e Add your logo, artwork or message in sharp digital colour for instant recognition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eRoyal Mail Large Letter compatible:\u003c\/span\u003e Sized to qualify as a Large Letter, helping reduce postage costs and improve delivery success.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003e5-star rated quality:\u003c\/span\u003e Trusted by businesses for consistent print finish and reliable strength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003ePrinted proof \u0026amp; satisfaction guarantee:\u003c\/span\u003e Approve a full printed sample of your Large Letter box before full production.*\u003cbr\u003e\u003cspan class=\"font10\"\u003e*Please note this excludes printed single sample orders.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eFast turnaround:\u003c\/span\u003e Printed and delivered in as little as a few days for quick restocks and campaigns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eUK made \u0026amp; printed:\u003c\/span\u003e Manufactured and printed in the UK to reduce carbon footprint and delivery time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eFSC® certified board:\u003c\/span\u003e Produced using responsibly sourced materials with 60%–90% recycled content.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eStrong yet lightweight:\u003c\/span\u003e Rigid corrugated kraft board with triple-layer protection for secure posting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eBrown or white finish:\u003c\/span\u003e Choose a natural kraft look or clean white outer for premium presentation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"bold\"\u003eSize guide:\u003c\/span\u003e Large Letter postal box sizes shown are the internal dimensions: \u003cspan class=\"bold\"\u003eWidth x Depth x Height\u003c\/span\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"producth3\"\u003eConsidering a printed sample?\u003c\/h3\u003e\n\u003cp\u003eWe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"bold\"\u003ePlease note:\u003c\/span\u003e Minor branding or barcodes may appear on the Large Letter cardboard boxes. Images shown are for guidance only and the supplied product may differ slightly.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"bold\"\u003eDue 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"producth3\"\u003eAuthentic Product Photography\u003c\/h3\u003e\n\u003cp\u003eAll 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.\u003c\/p\u003e\u003cdiv id=\"zakeke-product-tag\" style=\"display:none\" data-product-id=\"15234541846903\" data-enviroment=\"Customizer\"\u003e\u003c\/div\u003e","brand":"Parcelsend UK","offers":[{"title":"147mm x 138mm x 20mm \/ Brown \/ Kraft E-Flute \/ Outside Only","offer_id":56154821198199,"sku":"MCP-400565-PO-PSUK","price":1.43,"currency_code":"GBP","in_stock":true},{"title":"147mm x 138mm x 20mm \/ Brown \/ Kraft E-Flute \/ Inside Only","offer_id":56154821230967,"sku":"MCP-400565-PI-PSUK","price":1.43,"currency_code":"GBP","in_stock":true},{"title":"147mm x 138mm x 20mm \/ Brown \/ Kraft E-Flute \/ Inside \u0026 Outside","offer_id":56154821263735,"sku":"MCP-400565-P2-PSUK","price":1.79,"currency_code":"GBP","in_stock":true},{"title":"175mm x 165mm x 22mm \/ White E-Flute \/ Outside 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