ecommerce mailing boxes

ecommerce mailing boxes are corrugated boxes designed to protect online orders through picking, packing and delivery while presenting the brand cleanly on arrival. Custom Postal Boxes, a project of Vertex Packaging in Wolverhampton, makes ecommerce mailing boxes in custom sizes and print, with low minimum order quantities, free design support and free UK delivery.

Why ecommerce mailing boxes matter to online sellers

For an online shop, the delivery box is often the first physical contact a customer has with the brand. A box that arrives crushed, oversized or hard to open creates doubt before the product is even seen. A correctly sized mailer keeps products still, stacks well on a packing bench and opens neatly, which supports reviews, repeat orders and fewer damage returns.

Sizing is an economic decision as well as a protective one. A box full of air needs void fill, takes more shelf space and can push a parcel into a larger postage format. Measuring your best selling product combinations and designing boxes around them is one of the simplest ways an online seller can control both packaging spend and postage spend at the same time.

Single wall and double wall choices

Single wall corrugated board suits lighter orders such as clothing, books and boxed cosmetics. Double wall board adds crush resistance for heavier or more fragile loads and for boxes that may be stacked in a courier van. Match the board to the product weight and journey, and test with a real packed order dropped and shaken before committing.

Closures that speed up packing

Self seal strips remove the need for tape and give a consistent seal, while a tear strip lets the customer open the box cleanly without scissors. Tuck in flaps suit returns friendly designs where the box may be used again. The right closure saves seconds on every order, which becomes hours across a busy sales week.

Sizes and Royal Mail formats

Royal Mail charges by format as well as weight. Under the Royal Mail size and weight guide, a large letter is no more than 35.3 by 25 by 2.5 centimetres and 750 grams, a small parcel is no more than 45 by 35 by 16 centimetres and 2 kilograms, and a medium parcel allows up to 61 by 46 by 46 centimetres and 20 kilograms. Designing a mailer just inside a format can protect margin on every single order.

Build your range around your real baskets. Useful starting points include small shipping boxes for compact orders, letterbox postal boxes for flat items that should arrive without a doorstep wait and custom mailer boxes for printed presentation led formats.

Print that works in a delivery context

Outside print should stay bold and simple, because labels, handling marks and weather are part of real delivery life. Inside print is protected until opening, so it suits thank you messages, care advice, review requests and reorder prompts. Many sellers keep the outside restrained and put the memorable part of the design under the lid where only the customer sees it.

Packing advice for fewer returns

Place the heaviest item at the bottom, keep fragile items away from the box walls and corners, and fill remaining gaps so nothing can build momentum and strike the side. Photograph your packing method for the products you sell most, so every packer follows the same proven layout. Consistent packing is easier to train, faster to check and simpler to improve when a problem appears.

To choose sizes, list your top product combinations with their packed weights. Pricing depends on size, material and quantity, so contact the team for a quote with that list and the free design support team can help plan print that stays useful across the whole box range.

FAQs about ecommerce mailing boxes

What size mailing box should an online shop use?

Use the smallest box that holds the order with its protective packaging and closes properly. Measure your common product combinations, then check the packed size against your courier or Royal Mail format limits.

Are mailing boxes strong enough for fragile products?

Yes, when the board grade, box size and internal packing suit the product. Fragile items need a snug fit, separation from the box walls and enough cushioning, plus a board grade matched to the weight.

Can ecommerce mailing boxes be printed inside?

Yes. Inside print is popular for thank you messages, brand stories, care guidance and reorder prompts because it stays protected during delivery and is revealed only when the customer opens the box.

Do mailing boxes help reduce postage costs?

They can. A box designed inside a smaller postage format avoids paying for a larger format, and using less void fill and air reduces waste. Check packed dimensions and weight before ordering a full run.