buy postage boxes

When you buy postage boxes from Custom Postal Boxes, you choose sturdy cardboard boxes sized around your products and the Royal Mail size band you want to post in. Custom Postal Boxes, a project of Vertex Packaging based in Wolverhampton, manufactures postage boxes in house with low minimum order quantities, free design support and free UK delivery.

Why it pays to plan before you buy postage boxes

Postage is charged by size as well as weight in the UK, so an oversized box can move a light product into a costlier band and waste fill on every order. Start with the product, add the protection it genuinely needs, and then pick the smallest box that holds that combination safely. Search results for this topic are dominated by Royal Mail size charts and pack size listings, which tells you buyers compare dimensions first and branding second. Both matter, but dimensions decide your postage on every single parcel you send.

Match the box to the Royal Mail band

Royal Mail large letter allows items up to 35.3cm long, 25cm wide and 2.5cm deep, while a small parcel allows up to 45cm long, 35cm wide and 16cm deep. Measure the packed box on its outer faces, including tape and any bulge, because a box that swells when filled can cross a limit. The official Royal Mail Tracked services page sets out the current size and weight limits for large letters and parcels, and it is worth checking before a large packaging order is placed.

Allow for board thickness and fill

Internal size is what your product feels, while external size is what Royal Mail measures. Corrugated board thickness, a protective wrap and a small amount of paper fill all use space, so a product that measures close to a band limit on its own may need the next band once packed. Testing one packed sample, weighed and measured at home, prevents a costly surprise across a whole print run.

Which postage boxes to buy for different products

Flat and light goods such as prints, books and clothing accessories often suit letterbox friendly formats, while boxed goods, ceramics and sets need deeper postal boxes with stronger board. Our small postage boxes suit compact orders, letterbox postal boxes help flat items arrive when nobody is home, and cardboard postal boxes cover everyday ecommerce despatch in a range of sizes.

Single wall or double wall board

Single wall corrugated board is light, economical on postage weight and strong enough for most small goods, clothing and boxed items. Double wall board adds crush resistance for heavier, fragile or stacked loads, at the cost of a little more weight and storage space. If returns mention dented corners, upgrade the board or the fit before adding more fill, because movement inside the box causes much of the damage sellers blame on handling.

How to buy postage boxes from Custom Postal Boxes

Send us your product dimensions, its weight once wrapped, and the Royal Mail band you want to stay within. Pricing depends on size, material and quantity, and ordering is quote based, so you can compare a plain box and a printed box on equal terms before deciding. Custom print turns a plain parcel into a recognisable delivery, with your logo outside and a short message inside the lid if you wish.

Start with the postal boxes by size collection to see formats grouped by use, then contact us for a quote with your measurements. Low minimum order quantities make it practical to test a new size on real orders before committing to a larger run.

FAQs about buy postage boxes

What should I measure before I buy postage boxes?

Measure your product after wrapping it as you would for a customer, then record length, width, depth and weight. Choose the smallest box that holds that packed size safely and stays inside your chosen Royal Mail size band.

Can postage boxes be printed with my branding?

Yes. Postage boxes can carry your logo, colours and a message inside the lid, turning each delivery into a recognisable brand moment. Free design support is included to help prepare artwork correctly.

Which board strength do most online sellers need?

Single wall corrugated board suits most light and medium weight orders. Choose double wall board for heavier goods, fragile items or parcels that will be stacked in transit, where extra crush resistance matters.

Do postage boxes arrive flat or assembled?

Most postage boxes are supplied flat to save storage space and are quick to fold and tape or seal at the packing bench. Tell us how you pack and we will recommend a format that suits your routine.

How do I get a price for postage boxes?

Request a quote through our contact page with your box size, board choice and quantity. Pricing depends on size, material and quantity, and delivery within the UK is free.