--- title: "Royal Mail Postage Boxes | PIP Postal Boxes | Packaging P…" url: https://www.packagingpanda.co.uk/royal-mail-postage-boxes.html description: "Royal Mail postage boxes in 20mm Large Letter PIP sizes. Flat-packed recyclable corrugated boxes with fold-over lids for lower-cost postal dispatch." lang: en-GB --- 10% Off Your First Order – 10% Off First Order – Use Code WELCOME10 sales@packagingpanda.co.uk Email Us (sales@packagingpanda.co.uk) My Account: https://www.packagingpanda.co.uk/account Sign In: https://www.packagingpanda.co.uk/account/login Create Account: https://www.packagingpanda.co.uk/account/register Home (https://www.packagingpanda.co.uk/)› Cardboard Boxes (https://www.packagingpanda.co.uk/cardboard-boxes.html)› Royal Mail Postage Boxes Image: Royal Mail Postage Boxes — bespoke custom packaging from Packaging Panda (https://www.packagingpanda.co.uk/images/products/royal-mail-postage-boxes.webp) # Royal Mail Postage Boxes Royal Mail postage boxes in 20mm Large Letter PIP sizes. Flat-packed recyclable corrugated boxes with fold-over lids for lower-cost postal dispatch. - Royal Mail postage boxes held at 20mm depth to qualify for the Large Letter PIP band - Sizes from 101 x 101mm to 333 x 123mm, supplied flat-packed - Die-cut fold-over lid — assembles in seconds with no tape needed on the base - Strong corrugated kraft board that protects in the postal network - 100% recyclable and made from recycled content ● In stock Free delivery All orders over £150 Next day delivery Order before 2pm Five-star rated 1,000+ UK businesses Live chat support Instant response Bespoke service Custom sizes & print | Image | Width | Length | Height | PIP Size | Pack qty | SKU | Price Per Pack (Ex VAT) | | | | Quantity | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1-4 Packs | 5-9 Packs | 10-25 Packs | 25+ Packs | | | | | | | | | | Image: Royal Mail Postage Boxes — 101 × 101 × 20 mm (https://www.packagingpanda.co.uk/images/products/royal-mail-postage-boxes.webp) | 101mm | 101mm | 20mm | Large Letter | 50 | WCALD0034 | £3.50 | £3.00 Save 14% | £3.00 Save 14% | £2.50 Save 29% | | | Image: Royal Mail Postage Boxes — 163 × 112 × 20 mm (https://www.packagingpanda.co.uk/images/products/royal-mail-postage-boxes.webp) | 112mm | 163mm | 20mm | Large Letter | 50 | WCALD0030 | £5.50 | £5.00 Save 9% | £5.00 Save 9% | £4.50 Save 18% | | | Image: Royal Mail Postage Boxes — 333 × 123 × 20 mm (https://www.packagingpanda.co.uk/images/products/royal-mail-postage-boxes.webp) | 123mm | 333mm | 20mm | Large Letter | 50 | WCALD0035 | £12.50 | £11.50 Save 8% | £11.00 Save 12% | £10.00 Save 20% | | | Image: Royal Mail Postage Boxes — 218 × 159 × 20 mm (https://www.packagingpanda.co.uk/images/products/royal-mail-postage-boxes.webp) | 159mm | 218mm | 20mm | Large Letter | 50 | WCALD0031 | £7.50 | £7.00 Save 7% | £6.50 Save 13% | £6.00 Save 20% | | | Image: Royal Mail Postage Boxes — 110 × 220 × 20 mm (https://www.packagingpanda.co.uk/images/products/royal-mail-postage-boxes.webp) | 220mm | 110mm | 20mm | Large Letter | 50 | WCALD0033 | £7.50 | £7.00 Save 7% | £6.50 Save 13% | £6.00 Save 20% | | | Image: Royal Mail Postage Boxes — 320 × 230 × 20 mm (https://www.packagingpanda.co.uk/images/products/royal-mail-postage-boxes.webp) | 230mm | 320mm | 20mm | Large Letter | 50 | WCALD0032 | £13.50 | £12.00 Save 11% | £11.50 Save 15% | £10.50 Save 22% | | ↑ Click any row to see size diagram, scale reference, and add to cart ## Postal boxes sized to Royal Mail PIP bands Royal Mail prices parcels by size as well as weight — a system called PIP (Pricing in Proportion). Every box in this range is 20mm deep, which keeps it inside the Royal Mail Large Letter allowance of 353mm x 250mm x 25mm, so an item that would otherwise be charged as a Small Parcel can go at the cheaper Large Letter rate. Choose a box that fits your product snugly and the depth does the rest. ## Royal Mail size bands at a glance | Royal Mail format | Maximum size | Boxes in this range | | --- | --- | --- | | Letter | 240 x 165 x 5mm | Too shallow for a box — use an envelope | | Large Letter | 353 x 250 x 25mm | All six sizes below (20mm deep) | | Small Parcel | 450 x 350 x 160mm | Any of these boxes, plus our deeper mailing boxes | ## Large Letter postage boxes (20mm depth) Flat-packed sizes from 101 x 101mm up to 333 x 123mm and 320 x 230mm, all held at 20mm deep. They suit jewellery, cosmetics, phone cases, prints, greetings cards, stationery, small electronics and clothing that can be folded flat. Each box is die-cut with a fold-over lid and side tucks, so it assembles in seconds without tape on the base. ## Small Parcel postal boxes Anything over 25mm deep or heavier than 750g travels as a Small Parcel. If your item will not compress to Large Letter depth, our single wall cardboard boxes (https://www.packagingpanda.co.uk/single-wall-cardboard-boxes.html) and postal boxes with adhesive strip (https://www.packagingpanda.co.uk/postal-boxes-with-adhesive-strip.html) cover that band, and our cardboard postal tubes (https://www.packagingpanda.co.uk/cardboard-tubes.html) handle rolled prints and posters. ## How to choose the right postage box size Measure your product at its widest and longest points and add 5-10mm for padding. Pick the smallest box it fits — oversized boxes push you into a higher postage band and need more void fill. If you are shipping mixed products, two or three sizes usually cover most orders. All boxes are plain kraft brown, made from recycled corrugated board and fully recyclable kerbside. Wholesale pricing drops as pack quantities increase, and delivery is free on orders over £150 ex VAT. We use cookies to improve your experience. 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Every box in this range is 20mm deep, so it stays inside the 25mm depth limit and is charged at the Large Letter rate rather than as a Small Parcel." } }, { "@type": "Question", "name": "What does PIP mean on postage boxes?", "acceptedAnswer": { "@type": "Answer", "text": "PIP stands for Pricing in Proportion, the Royal Mail system that prices post by size as well as weight. PIP compliant postage boxes are made to fit the Letter, Large Letter or Small Parcel dimensions so you always pay the lowest possible band for your item." } }, { "@type": "Question", "name": "What is the difference between Large Letter and Small Parcel postal boxes?", "acceptedAnswer": { "@type": "Answer", "text": "Large Letter boxes are shallow — 25mm deep or less — and suit flat items such as prints, cards, jewellery, phone cases and folded clothing. Small Parcel boxes can be up to 450mm x 350mm x 160mm and are used for bulkier goods. 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