cardboard postage box

A cardboard postage box is a corrugated cardboard pack sized for sending goods through the post, chosen so the product fits snugly and the parcel stays inside the cheapest Royal Mail size band it can. The right cardboard postage box protects the contents, presents your brand and avoids wasted space. Custom Postal Boxes makes custom printed postage boxes in Wolverhampton, with low minimum order quantities, free design support and free UK delivery.

Choosing a cardboard postage box by Royal Mail band

Royal Mail charges by size band as well as by weight, so the box you pick can decide the postage you pay on every order. A slim packed item that stays within 353mm by 250mm by 25mm and 750g can travel as a large letter. Most everyday ecommerce orders sit in the small parcel band, which allows up to 450mm by 350mm by 160mm and 2kg. Bulkier goods move into the medium parcel band at up to 610mm by 460mm by 460mm and 20kg. Always check the current limits in the Royal Mail size and weight guide and measure the packed box, not the product alone, because board thickness and cushioning count towards the finished size.

Matching common products to the right band

Flat goods such as books, prints and folded clothing suit shallow boxes near the large letter limit, like our large letter postal boxes. Boxed cosmetics, candles, footwear and small electronics usually need a small parcel box with room for cushioning. Gift sets and multi item orders may justify a medium parcel box, but moving up a band for the sake of a few millimetres of empty space is money wasted on every single order.

Why a snug fit saves money twice

A box that fits well keeps the parcel in a lower band and also needs less void fill to stop the product moving. Less fill means lower material cost, faster packing and a parcel that arrives looking considered rather than rattling. Snug never means forced, though. Leave room for the product to be placed in and lifted out without bending the box walls.

Single wall or double wall board

Single wall corrugated board covers most everyday posting, because the fluted layer between the two outer sheets absorbs knocks while keeping the box light. Our single wall corrugated boxes explain that construction in more detail. Heavier, fragile or stacked goods may need double wall board, which adds a second fluted layer and noticeably stiffer walls for the same footprint.

Print, colour and packing advice

A printed postage box does quiet marketing work on every doorstep. White board gives the cleanest base for bright artwork, kraft board gives a natural look and hides scuffs well, and a single colour print can look sharp on either. Keep the delivery label area in mind when you place artwork, and keep handling messages where postal staff will see them. Inside the box, wrap fragile items, fill voids so nothing can shift, and close the box so the tape sits flat and the seams stay shut under handling.

Getting the everyday details right

Small habits protect margins. Weigh one fully packed box and record it, so your postage buying matches reality. Store flat boxes away from damp, because cardboard loses strength when it absorbs moisture. If you post the same product daily, a made to size box from our cardboard postal boxes range removes the guesswork and keeps every parcel consistent. For smaller orders, our small postage boxes cover the sizes most online sellers reach for first.

Ordering postage boxes from a UK maker

Custom Postal Boxes manufactures in house in Wolverhampton, so your boxes are made for your products rather than pulled from a general shelf. Pricing depends on size, material and quantity and every order is quote based. Request a quote through our contact page with your product measurements and the postal band you want to stay inside, and we will advise on board, size and print before you commit.

cardboard postage box FAQs

Practical answers on size bands, board grades, print and ordering for businesses that post goods every week.

What size cardboard postage box do I need?

Start with your product measurements, add room for cushioning, then compare the packed size with the Royal Mail bands. A packed box within 450mm by 350mm by 160mm and 2kg travels as a small parcel, which covers most everyday ecommerce orders.

Is a cardboard postage box strong enough for fragile items?

Yes, provided the board grade matches the contents and the item is cushioned so it cannot move. Fragile goods may suit double wall board or a fitted insert, and the packed box should be marked clearly so handlers know it needs care.

Can a cardboard postage box carry my branding?

Yes. Custom print can cover the outside and inside of the box with your logo, colours and messages. Share your artwork when you request a quote and free design support will help position it around the label area and seams.

Do you sell single postage boxes or only bulk orders?

We manufacture to order with low minimum order quantities, which suits small and growing UK businesses as well as larger senders. Tell us the quantity you have in mind when you request a quote and we will price that exact volume.