{"product_id":"large-letter-postal-boxes-premium-size-1-8","title":"Letter Box Postal Boxes (Premium) – Size 1–8","description":"\u003ch2\u003e\u003cstrong\u003eLarge Letter Boxes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eLightweight, letterbox‑friendly packaging designed to meet \u003cstrong\u003eRoyal Mail Large Letter\u003c\/strong\u003e size rules. Perfect for small eCommerce items, documents and gifts, these boxes help you keep postage costs low while ensuring a smooth delivery experience.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMade from \u003cstrong\u003ehigh‑quality corrugated cardboard\u003c\/strong\u003e, they provide a snug, protective fit that reduces movement and helps prevent damage — especially when paired with bubble wrap. Their \u003cstrong\u003eplastic‑free\u003c\/strong\u003e, \u003cstrong\u003e100% recyclable\u003c\/strong\u003e and \u003cstrong\u003ebiodegradable\u003c\/strong\u003e design makes them an eco‑friendly choice for modern businesses.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBranding is printed discreetly on the inside, remaining hidden once constructed. Some products in this range follow the same box style but fall under \u003cstrong\u003eSmall Parcel\u003c\/strong\u003e sizing — please check dimensions before packing. Avoid overfilling to stay within Royal Mail’s Large Letter restrictions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNext‑day shipping options available to keep your orders moving quickly.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e📦 Size Guide\u003c\/h3\u003e\n\u003cp\u003eAll measurements shown are internal dimensions. Choose your required size from the options above.\u003c\/p\u003e\n\u003ctable style=\"width: 100.087%; height: 244.688px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003cth style=\"width: 25.394%; height: 39.1875px;\"\u003eSize\u003c\/th\u003e\n\u003cth style=\"width: 27.1454%; height: 39.1875px;\"\u003eInternal Measurements (mm)\u003c\/th\u003e\n\u003cth style=\"width: 46.7601%; height: 39.1875px;\"\u003eInternal Measurements (inches)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 27.7188px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 27.7188px;\"\u003eSize 1\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e101 × 101 \u003cmeta charset=\"utf-8\"\u003e× 19\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 27.7188px;\"\u003e4 × 4 \u003cmeta charset=\"utf-8\"\u003e× 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 27.7188px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 27.7188px;\"\u003eSize 2\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e160 × 110 \u003cmeta charset=\"utf-8\"\u003e× 19\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e6.25 × 4.25 \u003cmeta charset=\"utf-8\"\u003e× 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 27.7188px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 27.7188px;\"\u003eSize 3\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e217 × 108 \u003cmeta charset=\"utf-8\"\u003e× 19\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e8.5 × 4.25 \u003cmeta charset=\"utf-8\"\u003e× 0.75\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 27.7188px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 27.7188px;\"\u003eSize 4\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv class=\"dimension\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e225 × 160 \u003cmeta charset=\"utf-8\"\u003e× 19\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e8.75 × 6.25 \u003cmeta charset=\"utf-8\"\u003e× 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 27.7188px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eSize 5\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e320 × 230 \u003cmeta charset=\"utf-8\"\u003e× 19\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e12.5 × 9 \u003cmeta charset=\"utf-8\"\u003e× 0.75\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 27.7188px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eSize 6\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e101 × 101 \u003cmeta charset=\"utf-8\"\u003e× 50\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 27.7188px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e4 × 4 \u003cmeta charset=\"utf-8\"\u003e× 2\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 19.5938px;\"\u003eSize 7\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e160 × 110 \u003cmeta charset=\"utf-8\"\u003e× 50\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e6.25 × 4.25 \u003cmeta charset=\"utf-8\"\u003e× 2\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 25.394%; height: 19.5938px;\"\u003eSize 8\u003c\/td\u003e\n\u003ctd style=\"width: 27.1454%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e217 × 108 \u003cmeta charset=\"utf-8\"\u003e× 50\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 46.7601%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e8.5 × 4.25 \u003cmeta charset=\"utf-8\"\u003e× 2\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e  \u003cbr\u003e\u003c\/p\u003e","brand":"Salisbury Pack \u0026 Post","offers":[{"title":"Size 1 \/ PiP: Large letter","offer_id":58403857498499,"sku":"LBPB-LL1-N","price":0.5,"currency_code":"GBP","in_stock":false},{"title":"Size 2 \/ PiP: Large letter","offer_id":58403857564035,"sku":"LBPB-LL2-N","price":0.6,"currency_code":"GBP","in_stock":true},{"title":"Size 3 \/ PiP: Large letter","offer_id":58403857629571,"sku":"LBPB-LL3-N","price":0.7,"currency_code":"GBP","in_stock":false},{"title":"Size 4 \/ PiP: Large letter","offer_id":58403857695107,"sku":"LBPB-LL4-N","price":0.8,"currency_code":"GBP","in_stock":true},{"title":"Size 5 \/ PiP: Large letter","offer_id":58403857760643,"sku":"LBPB-LL5-N","price":1.5,"currency_code":"GBP","in_stock":true},{"title":"Size 6 \/ PiP: Small Parcel","offer_id":58403973005699,"sku":"LBPB-SP1-N","price":0.6,"currency_code":"GBP","in_stock":false},{"title":"Size 7 \/ PiP: Small Parcel","offer_id":58403973038467,"sku":"LBPB-SP2-N","price":0.8,"currency_code":"GBP","in_stock":true},{"title":"Size 8 \/ PiP: Small Parcel","offer_id":58403973071235,"sku":"LBPB-SP3-N","price":0.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/4924\/5827\/files\/LetterBoxPostalBoxes.png?v=1783332625","url":"https:\/\/salisburypackandpost.co.uk\/products\/large-letter-postal-boxes-premium-size-1-8","provider":"Salisbury Pack \u0026 Post","version":"1.0","type":"link"}