Postal Boxes - Bulk Discounts, Next Day Despatch from Glasgow, UK

Packn’s postal boxes offer compact, strong, and professional packaging that are ideal for eBay traders, subscription boxes, gift boxes and other e-commerce retailers. We offer brown and white postal boxes, offering a range of finishes for smart and professional presentation of your goods. Many of our sizes comply with Royal Mail's guidelines, ensuring you can ship items with confidence that you won't be overcharged for oversized packages. All of our postage boxes are 100% recyclable and biodegradable, making them a sustainable choice for businesses looking to reduce their environmental impact.

Order online for fast UK-wide delivery from our Glasgow warehouse and access bulk discounts on volume orders. Need regular shipping boxes? Check out our range of single wall cardboard boxes and double wall cardboard boxes.

Have questions? Check out our postal boxes FAQ's. Alternatively, contact our friendly team and we'd be happy to help!

Struggling to choose the right cardboard boxes? Check our handy wee guide that includes some of our staff picks.

Frequently Asked Questions (FAQs)

What is a postal box?

A postal box is a lightweight but sturdy cardboard box designed specifically for sending items through the post or with couriers. They provide protection for small to medium-sized goods and are widely used in e-commerce, retail, and personal shipping. Unlike mailing bags, postal boxes offer more structure, making them ideal for items that need extra security during transit.

What sizes do postal boxes come in?

Postal boxes are available in a wide range of sizes, from slim “large letter” boxes that keep postage costs low, to deeper small parcel or medium parcel boxes. We offer a range of sizes that would be compatible with Royal Mail guidelines, making it easier for businesses to choose packaging that fits within cost-effective postal categories.

Are postal boxes strong enough for shipping?

Yes, postal boxes are made from high-quality corrugated cardboard that provides excellent crush resistance and protection. While lightweight, they are strong enough to withstand the postal network, keeping items like books, cosmetics, electronics, or clothing safe during transit.

Can postal boxes be used for Royal Mail?

Absolutely. Many postal boxes are specifically designed to fall within Royal Mail Large Letter, Small Parcel, or Medium Parcel size bands. This allows businesses and individuals to keep postage costs predictable and affordable.

Always check the internal dimensions of the box against courier size guidelines before posting.

Are postal boxes recyclable?

Yes, postal boxes are 100% recyclable and biodegradable. Once used, simply flatten and place them into standard recycling waste streams. Please ensure you remove any excess tape or labels first.

How do you assemble a postal box?

We supply all of our postal boxes flat-packed for easy storage and transportation. To assemble, fold along the pre-scored lines and lock the flaps into place. 

Manufactured using the FEFCO 0426 and 0427 standards, our postal boxes require little or no tape to stay secure (dependant on contents). This makes for quick and efficient assembly and packing of your goods.

Do you need tape for postal boxes?

Not always. Some postal boxes, such as the FEFCO 0427 style, have self-locking tabs that hold them securely closed without the need for tape. While others, such as the FEFCO 0426 or “pizza box”, benefit from a strip of tape for extra security, particularly with heavier contents.

For branding and eco-conscious packaging, many businesses now use paper tape.

What are postal boxes best used for?

Postal boxes are ideal for e-commerce packaging, subscription boxes, gifts, books, electronics, health & beauty products, and clothing. They provide structure and protection while keeping postage costs down, making them the go-to packaging choice for online retailers.

Many businesses often have a preference for brown postal boxes and white postal boxes – use our handy product filters on the postal boxes category page to narrow down our range within this criteria.

Are postal boxes cheaper than mailing bags?

In most cases, mailing bags are cheaper because they use less material and weigh less. However, postal boxes offer superior protection and presentation, reducing the risk of damage and enhancing the unboxing experience for your customers. 

For fragile or premium items, postal boxes are often more cost-effective overall because they cut down on the number of returns and replacements required as a result of inferior protection for your goods during delivery.

We offer a range of bubble wrap, void fill and other protective packaging products to add that extra layer of security, especially for premium goods prone to damages.

Can I get branded or custom postal boxes?

Absolutely! Our team would be delighted to discuss your bespoke packaging requirements. Our in-house design team can provide rapid turnaround from concept to physical phototype thanks to our in-house CAD tables.

We can offer custom sizes, colours, and printed designs. Branded postal boxes are popular for e-commerce businesses  looking to improve brand recognition, customer experience, and professionalism.

Get in touch with our professional team of product experts to discuss your requirements.

Please note minimum order quantities may apply for bespoke packaging.

Do postal boxes protect against damage in transit?

Yes, postal boxes provide a strong protective shell. For fragile or delicate items, we recommend adding void fill, bubble wrap, or tissue paper inside the box to cushion contents further. The rigid structure of a postal box helps to prevent crushing far better than mailing bags alone.

Do I get a discount for buying in bulk?

We provide a range of bulk discount’s across our range of postal boxes.

Whether you need a small order or have to buy in bulk or even require a full pallet of boxes, we offer pricing for a range of budgets.

Our product table details our tiers of discounts for each box. This handy format allows you to browse our pricing with ease and offer low costs to a range of budgets.

Do you offer brown postal boxes and white postal boxes?

Yes. Our brown postal boxes are made from natural kraft cardboard, giving them a classic packaging look and superior strength. Our white postal boxes are finished with a clean white outer layer, providing a premium, professional appearance that’s ideal for retail or branded packaging.

Brown postal boxes are perfect for cost-effective shipping, storage, and everyday e-commerce packaging. They’re durable, eco-conscious, and ideal if presentation is less important than functionality.

White postal boxes are best for branded deliveries, subscription boxes, gifts, and premium products where customer presentation matters. They create a clean, high quality look and are easy to customise with logos, stickers, or branded tape.