custom postage box

A custom postage box is a postal box made and printed to your chosen size, so orders fit neatly inside and the packed parcel stays within the Royal Mail size band you plan to use. Custom Postal Boxes makes each custom postage box in Wolverhampton for UK online sellers, with low minimum order quantities, free design support and free UK delivery.

Why sellers choose a custom postage box

Stock cartons rarely match real products. A box that is too deep wastes filler and can push a light order into a higher postage band, while a box that is too small bulges and splits. A custom postage box removes that compromise. The dimensions follow your products, the board grade follows their weight, and the print carries your brand through the letterbox.

The gains show up daily. Packing staff work faster when the box fits first time, returns fall when goods stop rattling, and customers see a parcel that looks deliberate. For growing shops, that consistency is part of the product, because the box is the first physical contact many buyers have with the brand.

Large letter and small parcel planning

Royal Mail prices by format as well as weight, so the packed size decides the band. A large letter can measure up to 353mm by 250mm by 25mm and weigh up to 750g. A small parcel can measure up to 450mm by 350mm by 160mm and weigh up to 2kg. Designing a box to sit just inside one of those limits keeps postage predictable across thousands of orders. The Royal Mail guidance on tracked parcel sizes lists the current format limits in full.

Measure the packed parcel, not the product

The common sizing mistake is measuring the bare product and forgetting the wrap, the insert and the closure thickness. Measure a complete packed sample instead, at its widest and thickest points, and weigh it. If the sample sits close to a band limit, adjust the box early, because a few millimetres found at design stage save money on every parcel.

Materials and closures for postage boxes

Most postage boxes use corrugated cardboard, where a fluted layer between two liners gives strength at low weight. Slim large letter formats use a fine flute to stay within the thickness limit while resisting bending. Deeper parcel boxes can step up to a stronger grade or double wall build for heavier contents. Kraft and white finishes are both available, and the smooth outer liner takes print cleanly.

Closures shape the packing routine. A self seal strip closes a box in seconds and removes tape from the bench, while a tear strip lets the customer open the parcel cleanly without scissors. Our self seal mailer boxes and tear strip mailer boxes show both approaches, and standard taped cartons remain right for heavier or irregular loads.

Print inside and outside

Outside print identifies the sender, while inside print appears at the moment of opening. A short welcome line, care notes or a reorder prompt inside the lid costs little and is read by nearly every customer. Keep essential text clear of fold lines, and let free design support check the layout against the final box shape.

Ordering your custom postage box

Gather three things before you enquire: the internal size you need, the rough quantity per month, and any artwork you have. Pricing depends on size, material and quantity, so orders are quoted individually. Request a quote through our contact page and the team will confirm a specification that fits your products and your postage band. Common starting points include our A5 postal boxes and C4 postal boxes, and the full printed postal boxes range shows the print options available.

• Measure a fully packed sample, including wrap and inserts.
• Weigh the sample and note which Royal Mail band it falls in.
• Choose board grade based on weight and how the parcel is handled.
• Pick a closure that suits your packing speed and the customer opening.
• Prove the size before ordering print in volume.

custom postage box FAQs

How is a custom postage box different from a stock carton?

A stock carton comes in fixed sizes your products must fit around, while a custom postage box is made to your dimensions and printed with your artwork. The closer fit reduces filler, protects better and keeps parcels inside the intended postage band.

What Royal Mail band should I design my box for?

Design for the band your packed orders fall into. Flat items up to 353mm by 250mm by 25mm and 750g suit large letter, while boxed orders up to 450mm by 350mm by 160mm and 2kg suit small parcel. Measure and weigh a packed sample, because the finished parcel decides the band.

Can a custom postage box carry my logo and colours?

Yes. Logos, brand colours, patterns and messages can be printed outside and inside the box. Free design support is included, so artwork is placed correctly on the panels and checked before production.

What board should I choose for heavier orders?

Heavier or fragile orders suit a stronger corrugated grade or a double wall build, which resists crushing when parcels are stacked. Lighter goods are well served by single wall board, which keeps weight and postage down. Say what you are posting when you enquire and the grade can be matched to it.

How do I get a price for a custom postage box?

Pricing depends on size, board, print and quantity, so each order is quoted individually. Send your internal dimensions, expected quantities and artwork through the contact page for a written quote. Minimum order quantities are low and delivery across the UK is free.