{"title":"Envelopes","description":"\u003cp class=\"p1\"\u003eExplore our range of \u003cspan class=\"s1\"\u003ecardboard envelopes, board backed envelopes, and book mailer envelopes\u003c\/span\u003e, designed for UK e-commerce sellers, publishers, record shops, and online retailers. From lightweight corrugated mailers for cost-effective shipping to rigid, reinforced book mailers for thicker or fragile items, our envelopes provide reliable, cushioned protection for books, documents, media, and small goods.\u003c\/p\u003e","products":[{"product_id":"book-mailer-envelopes","title":"Book Mailer Envelopes","description":"\u003cp\u003eOur \u003cb\u003eBook Mailer Envelopes\u003c\/b\u003e (also known as rigid book mailers, capacity book mailers, or all-board envelopes) are expertly designed for UK e-commerce sellers, publishers, bookshops, and online retailers to deliver secure, cost-effective protection for books, magazines, documents, and similar flat or semi-rigid items during postal and courier shipping.\u003c\/p\u003e\n\u003cp\u003eMade from high-quality, rigid corrugated board or heavy-duty manilla\/cardboard (typically 300–400gsm with reinforced edges), these envelope-style mailers provide excellent resistance to bending, crushing, creasing, and impacts—ensuring contents arrive in pristine condition without the bulk or higher costs of traditional boxes.\u003c\/p\u003e\n\u003cp\u003eKey features and benefits include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSuperior rigid protection\u003c\/b\u003e — The sturdy board construction prevents flexing or damage from handling, sorting machines, conveyor belts, or multi-drop transit, making them far more reliable than standard padded envelopes or paper mailers for books, comics, catalogues, calendars, brochures, or photo prints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOptimised for Royal Mail savings\u003c\/b\u003e — Many popular sizes are tailored to fit within \u003cb\u003eRoyal Mail Large Letter\u003c\/b\u003e limits (max 353 × 250 × 25mm, up to 750g), allowing you to benefit from lower letter-rate postage rather than parcel rates—ideal for keeping shipping costs down on platforms like eBay, Etsy, Amazon, or your own website. Common sizes include A4-compatible options (e.g., around 234 × 334mm external or 180 × 235mm capacity styles with expandable gussets up to 40–50mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVersatile and practical\u003c\/b\u003e — Perfect for sending paperback books, hardbacks (thinner editions), magazines, graphic novels, sheet music, artwork prints, or bundled documents. Expandable gussets or adjustable flaps accommodate varying thicknesses without needing extra void fill in many cases, while providing a snug, secure fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEasy and efficient to use\u003c\/b\u003e — Supplied flat-packed for space-saving storage; quick to pack with peel-and-seal adhesive strips (self-adhesive\/hot-melt) for fast, tape-free closure in high-volume fulfilment or home operations. Many feature easy-open tear strips or rip tabs for a smooth, frustration-free unboxing experience that delights customers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProfessional and brand-friendly appearance\u003c\/b\u003e — Available in clean manilla brown (traditional and eco-looking) for a premium, modern vibe. Smooth surfaces accept high-quality labels, direct printing, or custom branding (logos, thank-you messages, or barcodes), enhancing perceived value and encouraging positive reviews, social shares, and repeat purchases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSustainable choice\u003c\/b\u003e — Produced from responsibly sourced, fully recyclable materials (often with significant post-consumer recycled content), supporting UK eco-friendly practices and helping your business meet sustainability targets without compromising on strength or reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCarrier compatibility\u003c\/b\u003e — Engineered to perform reliably with major UK services including Royal Mail (Large Letter or Small Parcel tiers), Parcelforce, Evri, DPD, Yodel, UPS, and DHL—reducing the risk of damage claims or returns.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBest suited for everyday non-fragile to moderately protected flat items like books and documents. For bulkier or heavier loads, greater fragility, or enhanced stacking needs, consider our double-wall options, book wrap mailers, or custom solutions.\u003c\/p\u003e\n\u003cp\u003eChoose our book mailer envelopes for affordable, dependable packaging that protects your products effectively, slashes postage expenses, streamlines your packing process, and delivers a professional first impression.\u003c\/p\u003e","brand":"BoxPac","offers":[{"title":"164 x 180mm","offer_id":53351675625736,"sku":"BP2301","price":9.95,"currency_code":"GBP","in_stock":true},{"title":"180 x 235mm","offer_id":56304134226184,"sku":"BP2302","price":12.68,"currency_code":"GBP","in_stock":true},{"title":"194 x 292mm","offer_id":56304134258952,"sku":"BP2303","price":16.58,"currency_code":"GBP","in_stock":true},{"title":"234 x 334mm","offer_id":56304134291720,"sku":"BP2304","price":20.48,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1022\/1571\/3032\/files\/book-mailer-envelopes-1.jpg?v=1776697879"},{"product_id":"board-backed-envelopes","title":"Board Backed Envelopes","description":"\u003cp\u003eOur \u003cb\u003eBoard Backed Envelopes\u003c\/b\u003e (also known as rigid board back envelopes, hard backed mailers, or \"Do Not Bend\" envelopes) are purpose-built for UK businesses, online sellers, artists, photographers, and professional services to deliver robust, affordable protection for flat or semi-rigid items that must remain crease-free and undamaged during postal or courier transit.\u003c\/p\u003e\n\u003cp\u003eConstructed with a strong grey board backing laminated to a durable 120gsm manilla or kraft paper front, these envelopes provide exceptional resistance to bending, crushing, folding, and impacts—far outperforming standard paper or padded envelopes for sensitive contents.\u003c\/p\u003e\n\u003cp\u003eKey features and benefits include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eOutstanding rigid protection\u003c\/b\u003e — The solid board back prevents flexing, creasing, or damage from rough handling, automated sorting, conveyor systems, or multi-drop journeys, making them ideal for photos, prints, artwork, certificates, important documents, brochures, catalogues, greeting cards, or thin calendars that need to arrive pristine.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRoyal Mail Large Letter optimisation\u003c\/b\u003e — Popular sizes are designed to fit within \u003cb\u003eRoyal Mail Large Letter\u003c\/b\u003e limits (max 353 × 250 × 25mm, up to 750g), enabling lower letter-rate postage instead of parcel fees—crucial for cost control on platforms like eBay, Etsy, Amazon, or your own site. Common options include C5 (229 × 162mm for A5 or folded A4), C4 (324 × 229mm for full A4 sheets), and slightly undersized variants like 352 × 249mm or 324 × 229mm to maximise savings while often qualifying as Large Letter rather than Small Parcel.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVersatile for everyday UK mailing\u003c\/b\u003e — Perfect for sending A5 cards, A4 documents\/artwork, A3 prints (in larger C3 sizes like 457 × 324mm), photographs, certificates, legal papers, or marketing materials. Many feature a shallow gusset or expandable design (up to 20–45mm) to accommodate slight thickness variations without compromising the flat profile.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSimple and efficient packing\u003c\/b\u003e — Supplied flat for space-efficient storage; quick to load with peel-and-seal adhesive strips (self-adhesive\/hot-melt) for fast, secure, tape-free closure in busy fulfilment centres, offices, or home-based operations. Often include easy-open tear strips or rip tabs for customer convenience and a smooth unboxing experience.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProfessional \"Please Do Not Bend\" branding\u003c\/b\u003e — Printed with prominent red \"Please Do Not Bend\" warnings on the front to alert handlers; available in natural manilla brown (traditional and eco-friendly look) or bright white finishes for a clean, premium appearance. \n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEco-friendly and sustainable\u003c\/b\u003e — Made from responsibly sourced, fully recyclable materials (frequently with post-consumer recycled content in the board and paper), aligning with UK sustainability goals and helping your business reduce environmental impact without sacrificing durability.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliable carrier performance\u003c\/b\u003e — Compatible with major UK services including Royal Mail (Large Letter or Small Parcel tiers), Parcelforce, Evri, DPD, Yodel, UPS, and DHL—minimising damage risks, claims, or returns.\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBest suited for non-fragile, flat items requiring bend resistance, such as documents, prints, and photos. For bulkier books, greater thickness, or enhanced cushioning needs, explore our book mailer envelopes, rigid boxes, or custom options.\u003c\/p\u003e\n\u003cp\u003eChoose our board backed envelopes for dependable, low-cost packaging that safeguards important items, optimises postage savings, streamlines your dispatch process, and ensures a professional delivery.\u003c\/p\u003e","brand":"BoxPac","offers":[{"title":"162 x 114mm \/ Brown","offer_id":53351677001992,"sku":"BP2001","price":14.8,"currency_code":"GBP","in_stock":true},{"title":"229 x 162mm \/ Brown","offer_id":56304272605448,"sku":"BP2002","price":10.42,"currency_code":"GBP","in_stock":true},{"title":"229 x 162mm \/ White","offer_id":56304272638216,"sku":"BP2003","price":12.03,"currency_code":"GBP","in_stock":true},{"title":"324 x 229mm \/ Brown","offer_id":56304272670984,"sku":"BP2004","price":17.35,"currency_code":"GBP","in_stock":true},{"title":"324 x 229mm \/ White","offer_id":56304272703752,"sku":"BP2005","price":19.43,"currency_code":"GBP","in_stock":true},{"title":"457 x 324mm \/ Brown","offer_id":56304272736520,"sku":"BP2006","price":14.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1022\/1571\/3032\/files\/board-backed-envelopes-5.jpg?v=1771518831"},{"product_id":"cardboard-envelopes","title":"Cardboard Envelopes","description":"\u003cp\u003eOur \u003cb\u003eCardboard Envelopes\u003c\/b\u003e (also known as corrugated mailers, fluted cardboard envelopes, or eco padded envelopes) are a robust, sustainable packaging solution tailored for UK e-commerce sellers, online retailers, small businesses, and professional mailers who need lightweight yet cushioned protection for books, documents, small parts, media items, and other semi-fragile goods during postal or courier shipping.\u003c\/p\u003e\n\u003cp\u003eConstructed from high-quality single-wall corrugated cardboard (featuring a protective fluted inner layer for added cushioning and rigidity, often with a kraft exterior), these envelopes combine the strength of rigid mailers with built-in shock absorption—offering better impact resistance and crush protection than standard padded bubble envelopes or plain paper mailers, while remaining fully recyclable and plastic-free.\u003c\/p\u003e\n\u003cp\u003eKey features and benefits include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eEnhanced cushioned protection\u003c\/b\u003e — The corrugated fluting provides excellent resistance to impacts, bending, crushing, and transit vibrations from handling, sorting machines, conveyor belts, or multi-drop journeys—ideal for paperback books, magazines, catalogues, small electronics accessories, cosmetics, jewellery boxes, thin hardware, or documents that benefit from extra padding without needing separate bubble wrap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRoyal Mail and carrier optimisation\u003c\/b\u003e — Many sizes are designed to fit within \u003cb\u003eRoyal Mail Large Letter\u003c\/b\u003e limits (max 353 × 250 × 25mm, up to 750g) for lower letter-rate postage savings, or Small Parcel tiers for slightly thicker contents—helping keep costs down on platforms like eBay, Etsy, Amazon, or your own website. Popular options include A5-compatible (around 215 × 150mm), A4 (e.g., 278 × 400mm or 303 × 413mm with gussets), and expandable variants up to 40–55mm depth for added capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eExpandable and versatile\u003c\/b\u003e — Features side gussets or expandable bases (often 30–55mm) allow accommodation of varying thicknesses, turning the envelope into a mini-box for bulkier items while maintaining a flat profile for easier posting. Perfect for everyday e-commerce products like apparel samples, beauty items, stationery sets, or bundled documents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eQuick and secure packing\u003c\/b\u003e — Supplied flat-packed for efficient, space-saving storage; fast to load with peel-and-seal adhesive strips (self-adhesive\/hot-melt) for reliable, tape-free closure in high-volume fulfilment centres, 3PL operations, or home-based setups. Many include easy-open tear strips for a customer-friendly unboxing experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProfessional and eco-conscious appearance\u003c\/b\u003e — Available in natural kraft brown (sustainable and rustic look) for a clean, premium vibe. Smooth surfaces accept high-quality labels, direct printing, or custom branding (logos, thank-you messages, or barcodes), enhancing perceived value, encouraging positive reviews, and aligning with UK sustainability goals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFully sustainable\u003c\/b\u003e — Made from responsibly sourced, 100% recyclable corrugated materials (often with high post-consumer recycled content), supporting circular economy practices and helping your business meet eco-friendly targets without compromising on durability or performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliable with major carriers\u003c\/b\u003e — Engineered for consistent performance with Royal Mail (Large Letter or Small Parcel), Parcelforce, Evri, DPD, Yodel, UPS, and DHL—reducing damage risks, claims, or returns.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBest suited for non-fragile to moderately protected items requiring cushioning and rigidity, such as books, media, or small goods. For purely rigid flat protection (no cushioning needed), consider our board backed envelopes; for heavier books or greater depth, explore rigid book mailers or double-wall options.\u003c\/p\u003e\n\u003cp\u003eChoose our cardboard envelopes for dependable, cost-effective, and environmentally friendly packaging that cushions your products reliably.\u003c\/p\u003e","brand":"BoxPac","offers":[{"title":"150 x 250mm","offer_id":53351677788424,"sku":"BP2201","price":12.68,"currency_code":"GBP","in_stock":true},{"title":"185 x 270mm","offer_id":56304294494472,"sku":"BP2202","price":15.21,"currency_code":"GBP","in_stock":true},{"title":"215 x 300mm","offer_id":56304294527240,"sku":"BP2203","price":17.36,"currency_code":"GBP","in_stock":true},{"title":"235 x 340mm","offer_id":56304294560008,"sku":"BP2204","price":18.33,"currency_code":"GBP","in_stock":true},{"title":"340 x 500mm","offer_id":56304294592776,"sku":"BP2205","price":31.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1022\/1571\/3032\/files\/cardboard-envelopes-6.jpg?v=1771519851"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1022\/1571\/3032\/collections\/cardboard-envelopes-1.jpg?v=1771520720","url":"https:\/\/www.boxpac.net\/collections\/envelopes.oembed","provider":"BoxPac","version":"1.0","type":"link"}