boxes for postage

boxes for postage are cartons sized and built to carry goods safely through Royal Mail and courier networks, from slim large letter boxes to sturdy medium parcel cartons. Choosing boxes for postage by band, weight and product fit keeps postage predictable and reduces damage in transit. Custom Postal Boxes manufactures custom printed boxes in Wolverhampton with low minimum order quantities, free design support and free UK delivery.

Choosing boxes for postage by size band

Royal Mail charges by size as well as weight, so the band your parcel falls into shapes what you pay on every order. Large letter covers items up to 353mm by 250mm by 25mm and 750g. Small parcel covers items up to 450mm by 350mm by 160mm and 2kg. Medium parcel covers items up to 610mm by 460mm by 460mm and 20kg. A box designed for the band you use most gives you the most usable space without tipping into the next price level.

Start with the product, not the box shelf

Measure your product at its widest points with its retail packaging on, then add room for protective wrap. Pick the smallest box that holds that measurement without forcing the lid. Forced lids bow outwards, add depth and can reclassify the whole parcel. A short test pack with your usual filler, tape and label shows the true finished size you will be charged on.

Why a few millimetres matter so much

Postage bands have hard edges. A parcel at 26mm deep is a small parcel even if everything else is tiny, and a parcel at 760g has passed the large letter weight limit. Accurate sizing is therefore a daily packing discipline, not a one off decision.

Materials and strength in boxes for postage

Single wall corrugated cardboard suits most everyday orders and keeps parcel weight low. Double wall board adds crush resistance for heavier, fragile or stacked goods and is worth choosing when returns from damage cost more than the board upgrade. Kraft finishes give a natural look, while white board shows colour print clearly. The Royal Mail size and weight guidance explains the bands in full and is worth checking before you fix a box size.

Within our range, small postage boxes cover most daily ecommerce orders, while cardboard postal boxes give a broad choice of postal formats. Heavier loads are better served by heavy duty shipping boxes built for weight and stacking.

Protection inside the box

Board strength alone does not protect a product that can move. Fill empty space with paper void fill, use board inserts for items with corners or glass, and keep fragile faces away from the box walls. A product held still in a correctly sized box survives drops and stacking far better than a loose product in an oversized carton with handfuls of filler.

Print, value and ordering

Printed postage boxes carry your brand through the delivery network and onto the doorstep. A clear logo, your web address and a short inside message cost little in artwork time yet make a plain parcel recognisable and reduce buyer confusion about who sent it. Print also helps in sorting and returns handling, because staff and customers can identify your parcels quickly without opening them.

Ordering is quote based, because price depends on size, material and quantity. Tell us what you post, how many boxes you need and the print you want, and we will quote for that exact specification. You can start the conversation on our contact page for a postage box quote. Boxes are manufactured in house in Wolverhampton, design support is free and UK delivery is free, which keeps the delivered cost clear from the outset.

A simple buying routine that works

List your five most common order types, pack each one as you normally would, record the finished size and weight, then match boxes to those records. Review the list when you add products or change filler. Businesses that follow this routine rarely overpay for postage and rarely need emergency packaging from a local shop at retail prices.

FAQs about boxes for postage

What box size should I choose for Royal Mail posting?

Choose by finished parcel size and weight. Large letter allows up to 353mm by 250mm by 25mm and 750g, small parcel allows up to 450mm by 350mm by 160mm and 2kg, and medium parcel allows up to 610mm by 460mm by 460mm and 20kg.

Are boxes for postage different from shipping boxes?

Postage boxes are usually sized around postal bands and lighter ecommerce goods, while shipping boxes are often larger cartons for courier loads and heavier contents. In practice the ranges overlap, and the right choice depends on size, weight and how the parcel travels.

How do I stop a parcel moving into a higher postage band?

Measure and weigh the fully packed parcel, keep tape flat, avoid overfilling so lids stay level, and leave a small margin below each band limit. Test packs catch most problems before a full batch is posted.

Can boxes for postage carry my branding?

Yes. Boxes can be printed inside and outside with your logo, colours and messages. Custom Postal Boxes includes free design support and manufactures in the UK with low minimum order quantities.

What board should I pick for fragile goods?

Choose double wall corrugated board for heavier or fragile items and add an insert or wrap so the product cannot move. For light flat goods, single wall board in a close fitting postal box is usually enough.

Right sized postage boxes protect the product, control the postage bill and present your business properly on every doorstep they reach.