Postal Guide
Maximize the efficiency of your deliveries by choosing the postal option best suited to your product, aligning with Royal Mail’s standards, dimensions, and weight requirements. This approach helps minimize costs for both you and your customers while reducing the risk of delays or damaged packages. Streamlining your order processing and shipping saves valuable time and money for your business.
| Letter | Large letter | Small parcel | Medium parcel | Large parcel | |
|---|---|---|---|---|---|
| Maximum length | 240 mm | 353 mm | 450 mm | 610 mm | > 610 mm |
| Maximum width | 165 mm | 250 mm | 350 mm | 460 mm | > 460 mm |
| Maximum height | 5 mm | 25 mm | 160 mm | 460 mm | > 460 mm |
| Maximum weight | 100 g | 750 g | 2 kg | 20 kg | 30 kg |
Office Packaging offers a full range of Royal Mail-compliant envelopes and parcels for all your delivery needs, including two envelope types and three parcel types.
The letter and large letter envelopes can take weights of up to 750 grams, making them ideal for greeting cards, folded and unfolded letters, magazines and small objects such as DVDs or plastic cards. By using the standard Royal Mail dimensions, you ensure that your shipping costs as little as possible, is less likely to experience delays, and will fit standard mail slots in the UK, minimising delivery problems and the administrative burden of lost and damaged packages. The two different sizes allow you to tailor your packaging to the letter content, allowing you to minimise costs for simple document shipping with standard letters.
Royal Mail parcels come in three sizes – small, medium and large – and can accommodate items from 2 kg up to 30 kg. Whether your company specialises in clothing, electronics or games and entertainment, any potential product offered by your business will find the perfect parcel type to match and provide the necessary size and weight capacity to ensure smooth and safe delivery with adequate protective packaging.



Jackson –
Easy to use
Great boxes very easy to use and light in weight. The delivery was quick and efficient
George P –
I bought these Premium Self Seal Small White PIP Royal Mail Large Letter Postal Boxes (C6 – 220 x 190 x 20mm) for sending out small online orders and they’ve been spot on. The self-seal strip is really strong and saves loads of time compared to taping every box. The size fits neatly within Royal Mail large letter limits, which helps keep postage costs down, and the white finish looks clean and professional for customers.
The boxes are easy to assemble, feel sturdy once made up, and arrive flat-packed in perfect condition. Really happy with the quality and they’ve become a staple for our shipping.