Postal guide

Do you need advice on postal sizing? Then our handy postal guide can help you.

Find out about the Royal Mail PIP sizes, and which of our postal products are suitable in line with the PIP sizes!

If you have any questions regarding postal sizes, or on any of our postal packaging products, please call us on 0800 288 8822.

But…what is a ‘PIP’?

PIP stands for Pricing in Proportion, and is related to the weight, length, width and thickness of a package.

Take a look at the table below to see where your product would fit in this sizing system, and what packaging would be best suited to use for it.

Postal Guide
Format Examples & Sizes Try our mailers and postal boxes



  • Greetings cards
  • Personal letters
  • Postcards
  • Bills


 Max weight: 100g
 Max length: 240mm
 Max width: 165mm
 Max thickness: 5mm

Large Letter

Large letter

  • A4 documents
  • CDs and DVDs in their cases
  • Certificates
  • Large greetings cards
  • Magazines


 Max weight: 750g
 Max length: 353mm
 Max width: 250mm
 Max thickness: 25mm

Small parcel wide option

Small parcel

Wide option

  • Gifts
  • Clothes
  • Books
  • Handbags
  • Board games
  • Mobile phones


 Max weight: 2kg
 Max length: 45cm
 Max width: 35cm
 Max thickness: 8cm

Small Parcel Deep option

Small parcel

Deep option

  • Shoes
  • Boots
  • Toasters
  • Irons
  • Tablets


 Max weight: 2kg
 Max length: 35cm
 Max width: 25cm
 Max thickness: 16cm

Medium parcel

Medium parcel

  • Gifts
  • Shoes
  • Heavy or bulky items
  • Laptops


 Max weight: 20kg
 Max length: 61cm
 Max width: 46cm
 Max thickness: 46cm

Small roll

Small roll

  • Posters
  • Candles
  • Prints


Rolls and cylinders up to and including 450mm in length and 80 mm in diameter.
Does not exceed 2kg.

Medium roll

Medium roll

  • Posters
  • Prints
  • Wall planners


Rolls or cylinders where the length plus twice the diameter is less than 1,040mm

with no dimension exceeding 900mm.

Does not exceed 20kg.