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Free advice and quotes

The widest range of protective case options from an independent UK supplier.

Market leading ESD safe packaging for any static sensitive products and components.

Huge range of options and impartial advice on genuinely sustainable packaging for your business.

Royal Mail Box Sizes

Custom design

Tailored to your requirements

UK trade supplier

Huge product selection

Reduce costs

Range of strategies and services

Selecting Your PIP Packaging

Compare all Royal Mail PIP Boxes at a glance

Whilst the range of Royal Mail PIP boxes (pricing in proportion) is not huge, it can still be difficult to select the correct option for your business (or even if you should be using them at all).

To help with your decision making process, the below table has been created. It allows a quick, at a glance view of all the requirements, limitations and details for each options available.

Plus, if you think you have found the right postal packaging for your business, you can click through for further information and buying advice.

Please note: Prices listed are First Class / Second Class for UK Standard service. All prices correct at time of publication.

Size Table

View all Royal Mail size / weight / etc. guidelines

PIP Size Max Length Max Width Max Depth Max Weight Delivery
Letter 240 mm 165 mm 5mm 0.1 Kg £1.25 / £0.75
Large Letter 353 mm 250 mm 25 mm 0.75 Kg 0.10 Kg = £1.95 / £1.55
0.25 Kg = £2.70 / £2.40
0.50 Kg = £3.30 / £2.70
0.75 Kg = £3.30 / £2.70
Small Parcel 450 mm 350 mm 160 mm 2 Kg 02 Kg = £4.19 / £3.49
Medium Parcel 610 mm 460 mm 460 mm 20 Kg 02 Kg = £6.29 / £5.49
10 Kg = £7.99 / £6.99
20 Kg = £11.99 / £10.49
Large Parcel > 610 mm OR > 460 mm OR > 460 mm 30 Kg
PIP Size Max Length Max Width Max Depth Max Weight Delivery


Tips on using the table

GWP understands that it can still be difficult to find exactly what you need, even with having all of the information in one place. As such, the diagram to the right / below this text (depending on what device you are reading this on) also highlights how the measurements of each box are calculated.

If you still cannot find precisely what you need using the table however, a member of the GWP team will be happy to offer expert advice. You can reach us on 01793 754 444 or by emailing

PIP Box (Royal Mail) size guide

Alternative Packaging Options

Other corrugated boxes and packaging available

Postal packaging boxes and mailers

Postal Packaging

Huge range of cardboard mailers and postal boxes

Cardboard bottle box with dividers and bottle of white wine

Bottle Packaging

Specialist packaging for shipping bottles safely

Ecommerce packaging boxes

Ecommerce Boxes

Plain or printed boxes to delight your customers

Korrvu Lok packaging


Innovative system for improved transit protection

Industrial transit packaging

Industrial & Transit

Durable, cost effective packaging for bulk shipping

Cardboard box dividers inside outer corrugated packaging

Inserts / Dividers

Improve protection, space and packing efficiency

Retail packaging and POS

Retail & POS

POS and packaging perfectly matched to your brand identity

Get In Touch

Genuinely cost effective and impartial

Looking for additional info, advice or even quotes on your corrugated packaging supply? GWP will be happy to help!

As a UK leading, independent manufacturer of corrugated packaging products, you can get truly unbiased advice on the best packaging option for your business. And with a focus on innovation, you can source boxes and designs that are not only unavailable anywhere else, but are beyond what you probably believe is possible.

Every quote provided is free, no obligation and with absolutely no pressure. Add the free expert advice and customer service of the highest level, and it allows you to source the right packaging – at the right cost – for your business.

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    Contact a member of our sales & support team directly

    John Elliott GWP Packaging

    John Elliott

    Product Adviser
    01793 754 444

    Bill Chapman, GWP Packaging product adviser

    Bill Chapman

    01793 754 444

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    Ian Heskins

    New Business Director
    01793 754 444

    Phone GWP Packaging

    01793 754 444

    Mon – Fri 08.00 – 17.00

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    Still looking for the perfect PIP or postal packaging for your business? A member of the GWP team is here to help...