buy postage boxes online

When you buy postage boxes online, the right choice depends on the size and weight of the packed item, because Royal Mail charges by format as well as weight. Custom Postal Boxes supplies custom printed postal and mailer boxes made in house in Wolverhampton, with low minimum order quantities, free design support and free UK delivery.

Start with the Royal Mail format when you buy postage boxes online

Royal Mail pricing in proportion sorts mail into letter, large letter, small parcel and medium parcel formats. A large letter can be no larger than 35.3cm by 25cm by 2.5cm and no heavier than 750g. A small parcel can be no larger than 45cm by 35cm by 16cm and no heavier than 2kg, while a medium parcel allows up to 61cm by 46cm by 46cm and 20kg. Choosing a box that keeps the packed item inside the smallest possible format is the simplest way to control postage spend.

Always measure the finished packed item, including any padding, rather than the product alone. The full current limits are set out on the Royal Mail Tracked 24 size guide, and checking them before you order boxes avoids the common mistake of a box that is a few millimetres too deep for large letter post.

Matching box styles to what you send

Flat items such as prints, books, documents and slim accessories suit shallow large letter boxes. Clothing, cosmetics and boxed gifts usually need small parcel boxes with enough depth for padding. Fragile goods need a box with room for cushioning on every side, because a tight fit in a thin box offers almost no protection against drops and stacking in transit.

What to check on a product listing before ordering

Check whether sizes shown are internal or external measurements, what board the box is made from, whether it arrives flat or assembled, and whether the price of postage for your own orders has been considered. A listing that only gives a product name and a photograph leaves the most important questions unanswered, so ask the supplier before you commit to a quantity.

Board, strength and print choices

Single wall corrugated board covers most everyday posting for light and medium weight goods. Double wall board adds stacking strength for heavier items and for parcels that will be stored in a warehouse before dispatch. Kraft board gives a natural brown finish that many independent brands prefer, while white board takes bright print well and looks clean for gift led products.

Custom print turns a plain posting box into part of your brand. A logo on the lid, a short message inside and clear handling wording all help the parcel feel considered. Print also helps customers recognise a repeat order and can reduce queries because your name is visible before the box is even opened. Keep artwork simple enough to read at arm length and avoid placing important text across folds or tape lines.

Packing well matters as much as the box

Fill empty space so the contents cannot move, seal every seam with suitable tape, and place the address label on the largest flat surface away from edges. For fragile items, wrap each piece separately and keep it away from the box walls. A quick test parcel sent to yourself shows how your packing stands up to a real journey through the postal network.

Ordering from Custom Postal Boxes

Browse small postage boxes for everyday orders, large letter postal boxes for flat items, letterbox postal boxes that fit through the door and cardboard postal boxes in custom sizes. Because ordering is quote based, pricing depends on size, material and quantity. Send those details through the contact page to request a postage box quote and the team will confirm the most suitable box for your products.

FAQs when you buy postage boxes online

What size postage box should I buy for my products?

Start from the packed size of your product including padding, then match it to a Royal Mail format. Large letter allows up to 35.3cm by 25cm by 2.5cm and 750g, while small parcel allows up to 45cm by 35cm by 16cm and 2kg. Buying the smallest box that still protects the contents keeps postage spend down.

Can I buy postage boxes online with my branding printed on them?

Yes. Custom Postal Boxes prints postal and mailer boxes to order, so your logo and artwork can appear inside and outside the box. Free design support is available to help you prepare artwork and check that text stays clear of folds and tape lines.

What is the difference between single wall and double wall boxes?

Single wall board has one layer of fluted board between the outer liners and suits most light and medium weight posting. Double wall board has two fluted layers, which gives greater stacking strength and crush resistance for heavier or more fragile goods and for parcels stored in stacks.

Do postage boxes come with free UK delivery?

Yes. Custom Postal Boxes offers free UK delivery, and the business is based in Wolverhampton where the boxes are manufactured in house. Delivery details for your order are confirmed when your quote is prepared.

How many postage boxes do I need to order?

Minimum order quantities are low, which suits new sellers testing a size and growing shops that do not want cash tied up in packaging stock. Tell the team the sizes and quantities you expect to use and they will quote on that basis.