Postal Boxes & Mailing Boxes: The UK’s Most Trusted Supplier

With over 20 years of experience as a trusted B2B packaging supplier, Kite Packaging has built a reputation for quality, reliability and expertise across thousands of UK businesses. All of our cardboard postal boxes are made from corrugated cardboard, offering excellent strength and protection for items in transit. Competitive pricing, flexible quantities and fast despatch make Kite the go-to choice for businesses of all sizes.

All customers benefit from free standard delivery on orders over £45. Wholesale discounts are available on bulk orders, and our team is on hand to advise on the right postal box for your products. Not sure which postal box is right for you? Talk to our team today.

Why UK Businesses Choose Kite for Postal Boxes

Choosing the right supplier for your postal packaging matters. Unreliable boxes, poor construction or incorrect sizing can result in damaged goods, failed deliveries and unhappy customers. At Kite Packaging, we combine one of the UK’s largest stockholdings of cardboard postal boxes with deep industry expertise, so you can order with confidence every time.

Our customers rate us 4.5 out of 5 on Trustpilot, and we hold BRC accreditation for storage and distribution alongside ISO 9001 and ISO 14001 certifications. We are also a certified Carbon Neutral business, committed to reducing our environmental impact. Recognised as UK Packaging Company of the Year, Kite is the supplier UK businesses rely on.

We operate from multiple regional distribution centres across the UK, ensuring fast, reliable delivery wherever you are. Whether you need a one-off order of postal boxes or a regular trade supply for ongoing ecommerce orders, Kite is here to help. Contact us for expert advice on choosing the right product for your business.

Postal Boxes by Size: Small, Large & Letterbox

Getting the right postal box starts with size. Choosing a box that fits your product correctly reduces wasted space, lowers postage costs and provides better protection in transit. Our range covers everything from compact letterbox-friendly options through to large posting boxes for bulkier items.

Small Postal Boxes & Small Parcel Boxes

Our small postal boxes and small parcel boxes are ideal for sending jewellery, cosmetics, accessories, gifts and other compact items safely and cost effectively. Available as flat packed units for easy storage, these cardboard postal boxes are simple to assemble and provide a secure outer box for items sent via Royal Mail or courier services.

Small postage boxes are a popular choice for ecommerce businesses looking to keep postage costs down while still delivering a professional, well-packaged customer experience. Buying in flexible quantities means you only order what you need, with the option to scale up as your order volumes grow.

Large Postal Boxes & Mailing Boxes

Our large postal boxes and large mailing boxes are designed for bulkier products that require extra space without compromising on structural integrity. Made from corrugated cardboard, these posting boxes provide the protection heavy or oversized items need when travelling through the postal network or via courier.

Whether you are sending artwork, clothing bundles, equipment or multi-item orders, our large range of postal boxes gives you the internal dimensions needed for a perfect fit. Buying in bulk ensures you always have stock on hand and keeps your cost per unit down. Browse our cardboard boxes range for additional options if your products require something even larger.

Letterbox Postal Boxes & Large Letter Packaging

Letterbox postal boxes are one of the most cost-effective ways to ship small, flat products. By staying within Royal Mail’s Large Letter dimensions, you can significantly reduce your postage costs compared to small parcel rates, while still ensuring your items arrive safely and securely.

Our large letter postal boxes are designed to pass through a standard letterbox, making them the practical choice for sending flat-packed gifts, documents, jewellery, seeds, cosmetics and subscription boxes. They are fully recyclable and available in a range of stock sizes.

Types of Postal Boxes: Brown, White & Coloured

The appearance of your postal packaging contributes to the overall unboxing experience your customers receive. We stock postal boxes in brown kraft, white and a choice of colours, so you can choose a finish that suits your brand and the nature of the products you are sending.

Brown Postal Boxes

Our brown postal boxes are made from natural kraft corrugated cardboard, offering a classic, professional appearance that is widely recognised and trusted in postal and courier environments. Brown is the most popular choice for everyday shipping and postal packaging across all industries.

Available in a comprehensive range of sizes and suitable for flat packed storage, our brown cardboard postal boxes are a reliable, cost-effective solution for businesses sending parcels every day. The natural kraft construction is fully recyclable and made from sustainably sourced materials.

White Postal Boxes

Our white postal boxes offer a cleaner, more premium finish that is particularly popular with gift brands, subscription box businesses, and retailers who want to enhance the unboxing experience. The white surface also accepts print clearly, making it well suited to businesses considering custom printing on their postal packaging.

Like our brown range, white postal boxes are available flat packed for easy storage and are made from corrugated cardboard for strong protection in transit. They are fully recyclable and available across a range of sizes.

Coloured & Branded Postal Boxes

Stand out from the moment your parcel arrives with our coloured postal boxes and custom printed options. Coloured mailing boxes are an excellent way to reinforce your brand identity throughout the delivery journey, turning a functional shipping box into part of your marketing.

We offer custom postal boxes with bespoke printing in your brand colours, with artwork and logo. Whether you need a short run or high-volume production, our team can help you design branded postal packaging that creates a memorable first impression. Contact us to discuss your custom printing requirements.

Postal Boxes for Ecommerce & Online Retail

Ecommerce businesses have specific demands when it comes to postal packaging: boxes must be strong enough to survive the courier network, easy and fast to pack, and available in the right sizes for a wide variety of products. Our ecommerce boxes and postal packaging range is specifically designed to meet these needs.

From subscription box fulfilment to next day delivery of individual orders, Kite provides the cost effective postal packaging solutions online retailers depend on. Our stock is available in flexible quantities with no minimum order, and wholesale pricing is available for businesses with high-volume requirements.

Quick Seal & Self-Seal Postal Boxes

Our quick seal postal boxes are designed to save time during packing. Rather than using tape to secure each box, they feature a self-locking or quick-fold design that speeds up packing lines without compromising on added security. This makes them a popular choice for fulfilment operations where speed and reliability are essential.

Self-seal postal boxes offer the dual benefit of a clean, professional finish and a tamper-evident closure, providing customers with confidence that their order has arrived intact. They are available in a range of sizes suitable for clothing, accessories and general retail goods.

Book Wrap Mailers & Specialist Postal Packaging

Our book wrap mailers and capacity book mailers are designed specifically for flat items such as books, magazines, prints, vinyl and framed artwork. They wrap tightly around the product to minimise movement and provide extra protection without the need for additional void fill.

We also stock foam-lined boxes and picture frame boxes for items that require cushioned protection during transit. These specialist postal packaging solutions are ideal for fragile or high-value products where standard corrugated cardboard boxes alone may not provide sufficient protection.

Royal Mail PiP Compliant Postal Boxes

Compliance with Royal Mail’s Pricing in Proportion (PiP) guidelines is essential for businesses that send through the Royal Mail network. Choosing boxes that align with the correct format dimensions means you pay the right postage rate and avoid unexpected surcharges.

Our postal boxes are designed to comply with Royal Mail PiP standards across the key format categories, including Large Letter and Small Parcel. We clearly indicate which products are suitable for each Royal Mail format, so you can order with confidence and ensure your packages qualify for the correct postage rate.

If you are unsure which Royal Mail format applies to your products, contact our team and we will help you find the right postal box for your specific mailing dimensions.

Durable Cardboard Postal Boxes: How They Protect Your Goods

Our cardboard postal boxes are made from corrugated cardboard, which is constructed by layering a corrugated paper core (called fluting) between two flat sheets of paper (called liners). This structure creates a durable, cushion-like form that protects your items from impacts, crushing and damage during transit through the postal network.

Our postal boxes have a single layer of corrugation as standard, making them ideal for small parcels and most everyday items. For heavier or more fragile goods, our double wall cardboard boxes provide an extra layer of protection in demanding shipping environments, including heavy items and long-distance freight.

All boxes are fully recyclable and are manufactured from materials containing 60 to 90 per cent recycled content, making them both durable and environmentally responsible. They are suitable as both inner and outer boxes depending on the nature of the products you are sending.

Choosing the Right Postal Box for Your Products

Finding the right postal box for your products does not need to be complicated. There are a few key factors to consider before you order, covering size, strength and the specific nature of the items you are sending.

Size & Efficiency

Choose your postal box so it fits your product comfortably, minimising excess space. Focus on the internal dimensions of the box and leave room for additional packaging materials where needed. A well-fitted box reduces movement during transit, lowers the risk of damage and can reduce your postage costs by keeping the parcel within a lower-cost Royal Mail format.

Flat packed postal boxes are an excellent choice for businesses with limited storage space, as they stack neatly and take up minimal room until they are needed. They are quick to assemble and provide the same level of protection as pre-formed alternatives.

Strength & Protection

Not all products need the same level of protection. Light, non-fragile items will be well served by standard single-wall corrugated postal boxes. For heavy items or items being sent on longer courier routes, consider a stronger construction.

For particularly heavy or high-value products, our double wall cardboard boxes provide significantly greater rigidity and crush resistance. For added security and postage protection, use packaging materials such as void fill or tissue inside the box alongside a strong outer tape.

Shipping Fragile Items Safely

Protecting delicate items such as ceramics, electronics and other breakables requires more than a well-sized box. Our foam-lined postal boxes provide a built-in cushioning layer, and our Air Shock range offers high-performance foam inserts designed to absorb impact during transit.

For artwork, prints and picture frames, our specialist picture frame boxes are designed to fit around the product securely, and our bubble lined padded envelopes offer a postal-ready alternative for flat, lightweight fragile items. Choosing the right level of internal protection is just as important as the outer box when it comes to fragile items.

Wholesale Postal Boxes: Bulk Pricing & Trade Discounts

Buying postal boxes wholesale from Kite means significant volume discounts without compromising on quality or delivery speed. Whether you need bulk postage boxes for a fulfilment operation, a regular trade supply for your ecommerce business, or cost-effective packaging for seasonal peaks, we offer tiered trade pricing across our full range.

Order by the pallet for the best per-unit cost, or mix and match different sizes within a single order. For recurring requirements, contact our trade team to set up a credit account and lock in preferential pricing. We also supply custom printed postal boxes for businesses wanting branded packaging at wholesale volumes.

For businesses that need to keep costs down across their full postal packaging spend, our wholesale pricing applies across the entire postal boxes category, including brown postal boxes, white postal boxes, and our specialist mailing formats.

Sustainable & Recyclable Postal Packaging

At Kite Packaging, sustainability is built into everything we do. We are a certified Carbon Neutral business, and our postal boxes are manufactured from corrugated cardboard containing 60 to 90 per cent recycled content. All of our cardboard postal packaging is fully recyclable at kerbside, helping your business reduce its environmental impact without any compromise on performance.

Our cardboard mailing boxes are made to FSC-certified standards where applicable, ensuring the materials used come from responsibly managed sources. We are committed to offering sustainable packaging solutions that meet the growing expectations of both businesses and their customers when it comes to eco-friendly postal packaging.

We continuously review our product range to expand the availability of recycled and recyclable options. If you have specific sustainability requirements or are looking to transition to greener postal packaging, get in touch with our team.

Frequently Asked Questions About Postal Boxes

Got questions about our postal packaging? Here is everything you need to know to help you choose the right option for your needs.

What Size Postal Box Do I Need?

The right size depends on the internal dimensions of the product you are sending. Measure your item and allow a small amount of space for protective packaging materials inside the box. As a guide, your postal box should be snug enough to prevent the product moving around, but large enough to accommodate any void fill or tissue paper you are using. If you are sending via Royal Mail, also check that the box dimensions fall within the correct format (Large Letter, Small Parcel, etc.) to ensure you are paying the right postage rate.

Are Postal Boxes Royal Mail Compliant?

Many of our postal boxes are designed to comply with Royal Mail’s Pricing in Proportion (PiP) guidelines. Royal Mail measures parcels based on format categories (Large Letter, Small Parcel, Medium Parcel), each with maximum dimensions and weight limits. We indicate which products are suitable for each format, so you can order with confidence. If you are unsure, our team can advise on the correct box for your specific requirements.

What Is the Cheapest Way to Post a Parcel Box?

The cheapest way to post a parcel box is to keep it within the Royal Mail Large Letter format where possible, as this attracts significantly lower postage rates than Small Parcel. Using a correctly sized letterbox postal box or large letter box means the parcel fits through a standard letterbox and qualifies for the lower rate. For parcels that must be sent as Small Parcel, comparing Royal Mail and courier rates for your specific dimensions and weights will identify the most cost-effective option.

Can I Get Custom Printed Postal Boxes?

Yes. Kite offers custom postal boxes with your branding, logo and artwork printed directly onto the box. Custom printing is available across a range of sizes and styles, helping your brand make a professional impression at every stage of the delivery journey. Contact us with your artwork and quantity requirements for a bespoke quote.

Where Can I Buy Postal Boxes Near Me?

You can buy postal boxes online from Kite Packaging with fast delivery to any UK address. We despatch from multiple regional distribution centres, with next day delivery available on most stock items. There is no need to search for a local supplier when we can deliver directly to your door, often the following working day. Browse our full range or contact our team for advice.

What Is the Difference Between a Postal Box and a Cardboard Box?

A postal box is a type of cardboard box specifically designed and sized for sending items through the postal network or via courier. Postal boxes are typically made from corrugated cardboard and are sized to comply with Royal Mail or courier format requirements. Standard cardboard boxes are a broader category that includes transit boxes, storage boxes and a wider range of dimensions that may not be optimised for posting. Our cardboard boxes range covers both categories.

Do You Offer Flat Pack Postal Boxes?

Yes. The majority of our postal boxes are supplied flat packed as standard. This makes them easy to store in large quantities without taking up valuable warehouse or stockroom space. Flat packed postal boxes are quick to assemble when needed, and they provide the same level of structural integrity as fully formed alternatives once assembled.

Do You Sell Postal Boxes Wholesale?

Yes. We offer wholesale pricing on postal boxes for businesses buying in volume. Tiered pricing applies across our full range, with better per-unit costs as quantities increase. For businesses with regular or high-volume requirements, contact our trade team to discuss a credit account and preferential pricing. We also supply mailing bags and a full range of postal packaging products at wholesale volumes.