Our cardboard boxes (or cartons) are made from corrugated sheets in either single wall boxes or double wall boxes. We have put together this packaging guide to help you identify exactly what you need so you’re not paying too much for shipping your products.
- Where Can I Post My Letter/parcel? - Royal Mail
- Royal Mail Parcel Letter Boxes
- Sending Letters And Parcels | Royal Mail
- Parcels, Letters, Envelopes, Weight And Size Guide - Royal Mail
Understanding Royal Mail Parcel Sizes
For smaller e-commerce businesses and hobbyists who ship out their products through the post, finding the right sized Royal Mail box can be crucial. Most UK mail is handled by Royal Mail, and they have various price brackets for different packaging sizes.
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We have put together this handy infographic to help you understand what shipping your products may cost when sending them first class:
If you sell products online, it is important to understand the pricing breaks and have packaging that will maximise your profits. A parcel only needs to go a few millimetres over the maximum allowed for it to affect the shipping costs considerably.
If you’re dispatching 20 2kg parcels each working day on a first class service using the ‘medium parcel’ size instead of the ‘small parcel’ size could cost you an extra £69 per day, or £365 per week. Do this for a year and the cost increases to just short of a staggering £19,000.
Box Recommendations:
LARGE LETTER
PIP(C4)/pip c5
Large letter packaging fits through most UK letterboxes making it an idea shipping box. View the full large letter packaging guide for further information.
SMALL PARCEL
4x4x4, 5x5x2.5, 5x5x5, 6x4x3, 6x4x4, 6x5x4, 6x6x6, 7x5x2.5, 7x5x5
8x6x4, 8x6x6, 9x6x3, 9x6x6, 9x7x3, 10x10x6, 12x7x3, 12x9x2,
12x9x4, 12x9x6, 17x13x6 subscription boxes (small / medium)8x6x2, 9x6x2
Both single wall and double wall options are available to provide adequate protection. Check out the full small parcel packaging guide for more information and packaging tips.
MEDIUM PARCEL
7x7x7, 8x8x8, 10x10x10, 12x9x9, 18x12x12, 18x13x134x4x13, 4x4x8, 7x7x10, 7x7x5, 8x8x6, 9x9x6, 9x9x9
For heavier products, it is recommended that a double wall shipping box is used for extra strength. Check out the full medium parcel packaging guide for more information and packaging tips.
INTERNATIONAL SIZE
If you're looking for custom packaging, our sister company Belmont Packaging can help. For more packaging information, read on!
Measuring Boxes
Standard corrugated boxes are always measured in the same order(with the box opening at the top);
The box dimensions, stated by a supplier, refer to the internal (usable) dimensions of the carton.
We supply a range of various sized boxes, and understand this can be daunting when you are unsure which size box you need. In order to find the right box for your needs, you will need to determine how large your product(s) will be that you wish to house in the same box.
Firstly, we suggest measuring your goods. It is good practice to measure your goods in the same way as manufacturers; length x width x height.This will make it easier for you when determining and picking a stock box size. It's also perhaps a good idea to think of other layouts of your products, as this can bring up other stock box options which may be suitable.
When choosing your box remember that bubble wrap, foam chips and other protective packaging material will add to the space needed. They are also great void fillers, if your box is slightly too large.It is best to select a box which is slightly larger in all 3 dimensions to allow room for the protective padding.
Ideally the best packaged goods are those which sit snugly inside the box, meaning minimal movement of your goods during transit.
Corrugated Board Descriptions
Where Can I Post My Letter/parcel? - Royal Mail
A standard corrugated board is made up of two main components; linear board and corrugated fluted paper. The sheet of fluted paper is sandwiched between the outside and inner liner which is then glued to the flat liner paper from scratch.
When searching for a corrugated case you will generally see a description of the board as Z125KT - this is a shorthand way of writing the board grade, paper weight and fluting size. Here’s what the breakdown means:
Z - Fluting size
125 - Paper weight
KT - Kraft/ test paper (outer/ inner liner)
Most boxes are a combination of Kraft and Test paper. Kraft paper is made of virgin fibres using softwoods from sustainable forests. This is the most commonly used paper outside of liner due to its nature. Test paper is mostly made up of recycled papers, giving it a mottled effect and is the most common inner liner used when creating corrugated packaging.
What are Single Wall Boxes?
Single wall boxes are constructed utilising one layer of fluting. They are most commonly used for e-commerce shipping packaging, as they are a cheaper alternative to double wall yet still provide an element of rigidity and cushioned protection required of a shipping box.
Single Wall boxes are reliant on the flute, to determine the properties of that case. For example, Z Flute combines lightweight with compression strength to withstand the rigours of shipping, stacking and consumer use, which is why we have chosen this fluting for oursingle wall stock boxes.
What are Double Wall Boxes?
Double Wall (BC) boxes are constructed with two layers of fluting, generally in two types of flute sizes. The 5-ply construction provides a greater strength over the double wall, making them the perfect choice for heavier items or items which require a higher level of protection.
Double wall boxes have an increased rigidity over single wall, making them ideal for long term storage.
Single Wall Boxes vs Double Wall Boxes
The difference is the thickness of the fluting relating to the strength of the box. Double wall is required for heavier and is more resistant to direct hits in transit. Single wall is ideal for e-commerce packaging due to the price and will protect lighter products without any issues, whereas, double wall is ideal for heavier and more fragile products.
Do I Need Custom Packaging?
If you're an e-commerce business, the answer will likely be no. However, modern shopping trends have changed, and if you're a business looking to take the next step and offer a more personalised customer experience, custom packaging may be for you. Our sister company, Belmont Packaging, has put together a blog that will help you decide if branded packaging is for your business or not.
Thousands of boxes supplied to clients throughout the UK
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The Royal Mail size and weight guide for the UK is a handy reference of the standard dimensions of letters and parcels in the UK for when you are sending products through the post.
Knowing the size of your packaging is important as if you are sending goods in packaging that is larger than needed could cost you a lot of money in the long run.
The Royal Mail splits the level of postage charges between letters and parcels.
The two different sizes of letter are ‘Letter’ and ‘Large Letter’. There are three types of parcel size: ‘Small Parcel’, ‘Medium Parcel’ and ‘Large Parcel’.
Royal Mail Parcel Sizes – UK
Royal Mail Parcel Letter Boxes
| Format | Max weight | Max length | Max width | Max thickness/depth |
|---|---|---|---|---|
| Small Parcel | 2kg | 45cm | 35cm | 16cm |
| Medium Parcel | 20kg | 61cm | 46cm | 46cm |
| Large parcel – via Parcelforce Worldwide | 30kg | 1.5m | 3m length and depth combined | |
| Tubes | Length of the item plus twice the diameter must be less than 104cm, with the greatest dimension less than 90cm. | |||
Small Parcels
Royal Mail small parcels are up to 450mm x 350mm x 160mm in size with a maximum thickness of 160mm and a weight limit of 2Kg.
The small parcel size would allow you to send a candle for example in an 0201 single wall box with dimensions of 152 x 152 x 102mm. You could also send a subscription box in an 0426 die cut box (250x200x100mm).
Take a look at just some of the small boxes we offer that could be posted as small parcels by the post office.
Medium Parcels
Royal Mail medium parcels are up to 610mm x 460mm x 460mm in size with a maximum thickness of 460mm and a weight limit of 20KG.
In terms of size, the boxes we recommend for 13 inch laptops would easily stay under the size limit, unless you have a lightweight laptop that weighs under 2KG, you will be charged for a medium parcel.
Large Parcels
Royal Mail large parcels are classed as bigger than 610mm x 460mm x 460mm in size or weigh in at more than 20KG.
Our double walled large boxes are ideal for transporting heavier goods being both sturdy and durable.
What is the Biggest Size Parcel the Post Office Will Take?
The biggest parcel the Royal Mail Post Office will take is one not larger than 2.5m length and 5m length and girth combined that weighs 30kg or less. Large parcels are sent via ParcelForce Worldwide.
Custom Parcel Boxes
We can produce custom sized packaging that not only will make sure you’re sending your goods in the optimal sized box but also provide your customers with a unique branding experience.
Royal Mail Letter Sizes – UK
| Format | Max weight | Max length | Max width | Max thickness/depth |
|---|---|---|---|---|
| Letter | 100g | 24cm | 16.5cm | 5mm |
| Large Letter | 750g | 35.3cm | 25cm | 2.5cm |
Letter
Royal Mail letters have a maximum length of 240mm, a maximum width of 165mm with thickness up to 5mm and a weight no more than 100g.
Large Letters
Royal Mail large letters have a maximum length of 353mm, a maximum width of 250mm with thickness up to 25mm and a weight no more than 750g.
Mail lite envelopes that fit the large letter dimensions would be perfect for sending a DVD or a mobile phone as they contain bubble wrap to protect the goods and also will be cheaper to send than a box.
Royal Mail Prices
Royal Mail have produced a Business Price Guide that contains parcel and letters pricing and also details of other services such as franking and internal postage.
Personal customers and marketplace seller prices are covered by their UK and International parcel
Sending Letters And Parcels | Royal Mail
and letter service prices guide and online UK parcel and letter price guide respectively.
Parcels, Letters, Envelopes, Weight And Size Guide - Royal Mail
Looking to end your package via DPD? We’ve also produced a guide to DPD Parcel Sizes.