{"title":"Mailing Boxes \u0026 Cartons","description":"\u003cnav aria-label=\"Breadcrumb\" class=\"mc-breadcrumb\"\u003e\u003ca href=\"https:\/\/www.mailcoms.co.uk\/\"\u003eHome\u003c\/a\u003e \/ \u003ca href=\"\/collections\/packaging-shipping-mailing\"\u003ePackaging Supplies\u003c\/a\u003e \/ \u003cspan\u003eMailing Boxes \u0026amp; Cartons\u003c\/span\u003e\u003c\/nav\u003e\n\u003cp\u003eA complete range of cardboard postal boxes and cartons for posting parcels safely. Choose by Royal Mail size to keep your postage costs down, or by box type for books, bottles, frames and more.\u003c\/p\u003e\n\u003ch2\u003eShop boxes by type\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/royal-mail-large-letter-size-boxes\"\u003eRoyal Mail Large Letter Size Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/royal-mail-small-parcel-size-boxes\"\u003eRoyal Mail Small Parcel Size Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/royal-mail-medium-parcel-size-boxes\"\u003eRoyal Mail Medium Parcel Size Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/single-wall-cardboard-boxes\"\u003eSingle Wall Cardboard Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/double-wall-cardboard-boxes\"\u003eDouble Wall Cardboard Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/brown-postal-cardboard-boxes\"\u003eBrown Postal Cardboard Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/white-postal-cardboard-boxes\"\u003eWhite Postal Cardboard Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/premium-postal-cardboard-boxes\"\u003ePremium Postal Cardboard Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/e-commerce-boxes\"\u003eE-commerce Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/book-wrap-mailers\"\u003eBook Wrap Mailers\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/capacity-book-mailers\"\u003eCapacity Book Mailers\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/cardboard-envelopes\"\u003eCardboard Envelopes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/corrugated-pocket-boxes\"\u003eCorrugated Pocket Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/pizza-boxes\"\u003ePizza Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/picture-frame-boxes\"\u003ePicture Frame Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/pillow-boxes\"\u003ePillow Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/telescopic-boxes\"\u003eTelescopic Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/wine-bottle-boxes\"\u003eWine Bottle Boxes\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy buy from Mailcoms\u003c\/h2\u003e\n\u003cp\u003eMailcoms is a trusted UK mailroom supplier, trading since 2005, with fast delivery and free UK delivery over £40.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I choose the right box size for Royal Mail?\u003c\/summary\u003e\u003cp\u003eMatch the box to the Royal Mail Large Letter, Small Parcel or Medium Parcel dimensions for the cheapest postage - we group boxes by these sizes.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between single and double wall?\u003c\/summary\u003e\u003cp\u003eDouble wall boxes have an extra layer of corrugated board for heavier or more fragile items, while single wall suits everyday parcels.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow fast is delivery?\u003c\/summary\u003e\u003cp\u003eStandard UK delivery is 3-5 working days and free on orders over £40, with a next working day option available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/shop.mailcoms.co.uk\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Packaging Supplies\",\"item\":\"https:\/\/shop.mailcoms.co.uk\/collections\/packaging-shipping-mailing\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Mailing Boxes \u0026 Cartons\",\"item\":\"https:\/\/shop.mailcoms.co.uk\/collections\/mailing-boxes-cartons\"}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I choose the right box size for Royal Mail?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Match the box to the Royal Mail Large Letter, Small Parcel or Medium Parcel dimensions for the cheapest postage - we group boxes by these sizes.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between single and double wall?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Double wall boxes have an extra layer of corrugated board for heavier or more fragile items, while single wall suits everyday parcels.\"}},{\"@type\":\"Question\",\"name\":\"How fast is delivery?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Standard UK delivery is 3-5 working days and free on orders over 40 pounds.\"}}]}\u003c\/script\u003e","products":[{"product_id":"single-wall-cardboard-boxes-350x250x170mm","title":"Single Wall Cardboard Boxes - 350x250x170mm","description":"\u003cp class=\"lineheightinherit\"\u003eOur brown single walled cardboard boxes (350x250x170mm) are designed to carry smaller, lighter items and loads. This is made possible by our 350x250x170mm reliable single wall cardboard boxes being made from a single layer of sturdy, high-quality cardboard which offers brilliant protection during transit.\u003c\/p\u003e\r\n\u003cp class=\"lineheightinherit\"\u003eWe not only supply single walled cardboard boxes but we can also supply double walled cardboard boxes. Double wall boxes are twice as strong as single wall boxes and they are just as reliable and of a high quality. \u003ca class=\"bold purpletext underlinetext\" title=\"View our range of Double Wall Cardboard Boxes\" href=\"https:\/\/www.mailcoms.co.uk\/franking-ink-labels\/packaging-shipping-mailing\/mailing-boxes-cartons\/double-wall-cardboard-boxes\/\"\u003eView our range of double wall cardboard boxes here.\u003c\/a\u003e\u003c\/p\u003e\r\n\r\n\u003ch3 class=\"h3_product_details\"\u003ePricing in Proportion (PiP) Sizes\u003c\/h3\u003e\r\n\u003cp class=\"lineheightinherit\"\u003eOur single wall cardboard boxes can be identified using Royal Mail's Pricing in Proportion index. \u003cspan class=\"bold\"\u003eOur 350x250x170mm sized single wall box specifically fall into the Royal Mail \u003cspan class=\"purpletext\"\u003e“Medium Parcel”\u003c\/span\u003e category.\u003c\/span\u003e\u003c\/p\u003e\r\n\r\n\u003ch3 class=\"h3_product_details\"\u003eKey features of our 350x250x170mm Single Wall Cardboard Boxes\u003c\/h3\u003e\r\n\u003cul\u003e\r\n \t\u003cli\u003eOur light-medium duty 350x250x170mm single wall packaging boxes adhere to Royal Mail's PiP guidelines, so you can accurately calculate your postage costs.\u003c\/li\u003e\r\n \t\u003cli\u003eThese 350x250x170mm boxes are manufactured from a single layer of sturdy quality cardboard to ensure protection and security during transit. Suitable for light-medium items.\u003c\/li\u003e\r\n \t\u003cli\u003eAll of our brown single wall cardboard boxes come flat packed.\u003c\/li\u003e\r\n \t\u003cli\u003eThese 350x250x170mm cardboard boxes are very easy to construct and can be used both professionally and for personal usage.\u003c\/li\u003e\r\n \t\u003cli\u003eMade from 60% to 90% recyclable material.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3 class=\"h3_product_details\"\u003eProduct Details\u003c\/h3\u003e\r\n\u003cul\u003e\r\n \t\u003cli\u003e\u003cspan class=\"bold\"\u003ehigh-quality corrugated boxes, perfect where presentation matters.\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003eColour:\u003c\/span\u003e Brown outer \u0026amp; brown inner.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003eExternal Dimensions (Length x width x height):\u003c\/span\u003e 350x250x170mm \/ 35x25x17cm.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003ePack Size:\u003c\/span\u003e Pack of 10, 25, 50, 75, 100, 200, 300 \u0026amp; 500.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003ePiP Size:\u003c\/span\u003e Medium Parcel.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003eMailcoms SKU:\u003c\/span\u003e MCP-MCPIP352-RM.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"pinktext bold\"\u003ePlease Note:\u003c\/span\u003e These boxes are manufactured with a potential 10mm tolerance either way and this would need to be taken into consideration when purchasing. A sample service is available for you to test our products before purchase if this is perceived to be a potential issue.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold pinktext\"\u003ePlease Note:\u003c\/span\u003e branding\/barcodes may appear on parts of the cardboard box. Images are for reference purposes only and there may be slight variances to the product supplied.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp class=\"bold lineheightinherit\"\u003eAll third-party product names, product codes, product SKU's and company names are trademarks™ or registered® trademarks of their respective holders. Use of these names or codes does not imply any affiliation with or endorsement by the trademark holder and nor does it suggest any reference or comparison to the quality of our goods vs the quality of the goods of the trademark holder.\u003c\/p\u003e\r\n\u003cp class=\"bold lineheightinherit\"\u003eDue to manufacturer tolerances, actual item dimensions may vary by 10–20mm. If precise sizing is important for your project, we strongly recommend requesting a sample before placing your order.\u003c\/p\u003e","brand":"Mailcoms","offers":[{"title":"Pack of 10","offer_id":53806667333975,"sku":"MCP-MCPIP352-RM-10","price":7.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 25","offer_id":53806667366743,"sku":"MCP-MCPIP352-RM-25","price":18.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 50","offer_id":53806667399511,"sku":"MCP-MCPIP352-RM-50","price":37.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 75","offer_id":53806667432279,"sku":"MCP-MCPIP352-RM-75","price":56.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 100","offer_id":53806667465047,"sku":"MCP-MCPIP352-RM-100","price":74.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 200","offer_id":53806667497815,"sku":"MCP-MCPIP352-RM-200","price":149.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 300","offer_id":53806667530583,"sku":"MCP-MCPIP352-RM-300","price":224.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 500","offer_id":53806667563351,"sku":"MCP-MCPIP352-RM-500","price":373.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1024\/9283\/2087\/files\/MCP-PIP352-EXAMPLE3.png?v=1781690074"},{"product_id":"royal-mail-small-parcel-size-boxes-450x350x160mm","title":"Royal Mail's Small Parcel Size Boxes - 450x350x160mm","description":"\u003cp class=\"lineheightinherit\"\u003eOur brown Royal Mail's small parcel single walled cardboard boxes (450x350x160mm) are designed to carry smaller, lighter items and loads. This is made possible by our 450x350x160mm reliable single wall cardboard boxes being made from a single layer of sturdy, high-quality cardboard which offers brilliant protection during transit.\u003c\/p\u003e\r\n\u003cp class=\"lineheightinherit\"\u003eOur 450x350x160mm Royal Mail Maximum size small parcel cardboard postal boxes are manufactured from single wall cardboard with a high-quality brown outer to make packages stand out. Based on our own experience, it is important that your products are not just well packaged, but that the packaging itself is representative of the quality of your products. Our Royal Mail's small parcel size postal box (450x350x160mm) is one product that is perfect for making the right impression on your customers.\u003c\/p\u003e\r\n\u003cp class=\"lineheightinherit\"\u003eWe not only supply single walled cardboard boxes but we can also supply double walled cardboard boxes. Double wall boxes are twice as strong as single wall boxes and they are just as reliable and of a high quality. \u003ca class=\"bold purpletext underlinetext\" title=\"View our range of Double Wall Cardboard Boxes\" href=\"https:\/\/www.mailcoms.co.uk\/franking-ink-labels\/packaging-shipping-mailing\/mailing-boxes-cartons\/double-wall-cardboard-boxes\/\"\u003eView our range of double wall cardboard boxes here.\u003c\/a\u003e\u003c\/p\u003e\r\n\r\n\u003ch3 class=\"h3_product_details\"\u003ePricing in Proportion (PiP) Sizes\u003c\/h3\u003e\r\n\u003cp class=\"lineheightinherit\"\u003eOur single wall cardboard boxes can be identified using Royal Mail's Pricing in Proportion index. \u003cspan class=\"bold\"\u003eOur 450x350x160mm sized single wall box specifically fall into the Royal Mail \u003cspan class=\"purpletext\"\u003e'Small Parcel'\u003c\/span\u003e category.\u003c\/span\u003e\u003c\/p\u003e\r\n\r\n\u003ch3 class=\"h3_product_details\"\u003eKey features of our 450x350x160mm Single Wall Cardboard Boxes\u003c\/h3\u003e\r\n\u003cul\u003e\r\n \t\u003cli\u003eOur light-medium duty 450x350x160mm single wall packaging boxes adhere to Royal Mail's PiP guidelines, so you can accurately calculate your postage costs.\u003c\/li\u003e\r\n \t\u003cli\u003eThese 450x350x160mm boxes are manufactured from a single layer of sturdy quality cardboard to ensure protection and security during transit. Suitable for light-medium items.\u003c\/li\u003e\r\n \t\u003cli\u003eAll of our brown single wall cardboard boxes come flat packed.\u003c\/li\u003e\r\n \t\u003cli\u003eThese 450x350x160mm cardboard boxes are very easy to construct and can be used both professionally and for personal usage.\u003c\/li\u003e\r\n \t\u003cli\u003eMade from 60% to 90% recyclable material.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3 class=\"h3_product_details\"\u003eProduct Details\u003c\/h3\u003e\r\n\u003cul\u003e\r\n \t\u003cli\u003e\u003cspan class=\"bold\"\u003ehigh-quality corrugated boxes, perfect where presentation matters.\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003eColour:\u003c\/span\u003e Brown outer \u0026amp; brown inner.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003eExternal Dimensions (Length x width x height):\u003c\/span\u003e 450x350x160mm \/ 45x35x16cm.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003ePack Size:\u003c\/span\u003e Pack of 10, 25, 50, 75, 100, 200, 300 \u0026amp; 500.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003ePiP Size:\u003c\/span\u003e Small Parcel.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold\"\u003eMailcoms SKU:\u003c\/span\u003e MCP-MCPIP453-RM.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"pinktext bold\"\u003ePlease Note:\u003c\/span\u003e These boxes are manufactured with a potential 10mm tolerance either way and this would need to be taken into consideration when purchasing. A sample service is available for you to test our products before purchase if this is perceived to be a potential issue.\u003c\/li\u003e\r\n \t\u003cli\u003e\n\u003cspan class=\"bold pinktext\"\u003ePlease Note:\u003c\/span\u003e branding\/barcodes may appear on parts of the cardboard box. Images are for reference purposes only and there may be slight variances to the product supplied.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp class=\"bold lineheightinherit\"\u003eAll third-party product names, product codes, product SKU's and company names are trademarks™ or registered® trademarks of their respective holders. Use of these names or codes does not imply any affiliation with or endorsement by the trademark holder and nor does it suggest any reference or comparison to the quality of our goods vs the quality of the goods of the trademark holder.\u003c\/p\u003e\u003cp class=\"bold lineheightinherit\"\u003eDue to manufacturer tolerances, actual item dimensions may vary by 10–20mm. If precise sizing is important for your project, we strongly recommend requesting a sample before placing your order.\u003c\/p\u003e","brand":"Mailcoms","offers":[{"title":"Pack of 10","offer_id":53806668579159,"sku":"MCP-MCPIP453-RM-10","price":10.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 25","offer_id":53806668611927,"sku":"MCP-MCPIP453-RM-25","price":26.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 50","offer_id":53806668644695,"sku":"MCP-MCPIP453-RM-50","price":53.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 75","offer_id":53806668677463,"sku":"MCP-MCPIP453-RM-75","price":80.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 100","offer_id":53806668710231,"sku":"MCP-MCPIP453-RM-100","price":107.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 200","offer_id":53806668742999,"sku":"MCP-MCPIP453-RM-200","price":215.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 300","offer_id":53806668775767,"sku":"MCP-MCPIP453-RM-300","price":323.99,"currency_code":"GBP","in_stock":true},{"title":"Pack of 500","offer_id":53806668808535,"sku":"MCP-MCPIP453-RM-500","price":538.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1024\/9283\/2087\/files\/MCP-PIP453-EXAMPLE1.png?v=1781690074"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1024\/9283\/2087\/collections\/boxes-400x355-1.png?v=1782292601","url":"https:\/\/shop.mailcoms.co.uk\/collections\/mailing-boxes-cartons.oembed","provider":"Mailcoms Ltd","version":"1.0","type":"link"}