Custom Mailer Boxes for UK Brands

Custom mailer boxes are chosen around the product, the route it travels and the way a customer opens it. Start with the packed item rather than guessing a standard size: measure its longest, widest and tallest points, including fixed lids or fittings. Note whether the box will hold the product alone, include an insert, or sit inside another shipping carton. These details help the team discuss a suitable structure and board for your brief.

Measure the product and its pack-out

Record the internal length, width and height you need after the product is packed. Include protective wrap, an insert, accessories and any parts that cannot be removed. A close fit can reduce movement, but the product still needs room to be placed into the box without forcing the closure. If you are unsure about clearance, send the product measurements and a photo so the proposed dimensions can be reviewed before artwork is prepared.

For a set or subscription order, list each item and how it should sit inside the box. Multiple products may need a divider or a shaped insert, and that can change the internal layout. Keep the outer shipping route in mind too: a mailer that is packed into a second carton has different requirements from a box that will travel on its own. Confirm those use details with the dimensions.

Confirm board, print and finishing options

The available board grade, thickness, print coverage and finishing options depend on the selected product and specification. Share the intended use, approximate packed weight and any handling requirements so the team can confirm which constructions can be quoted. Do not select a material based on a general label alone; ask for the proposed grade and written specification for the exact box.

Artwork should follow the approved dieline for the chosen structure. Before production, review the proof for dimensions, panel orientation, text, colour references and any inside-print or finish details that matter to the brand. If you have not prepared print files, include that in the brief and ask which artwork support is available for the selected product.

Plan quantity, approval and delivery

The published minimum order is 100 boxes per size and design. If your project uses more than one size or artwork version, list each quantity separately so the quote can reflect the full brief. Price is confirmed after the dimensions, board, print, quantity and delivery destination have been reviewed; this page does not promise a fixed unit price.

Production and UK delivery timing depends on the agreed specification, quantity and destination. Confirm the schedule and delivery charges in the written quote before proceeding. A clear brief makes it easier to resolve open questions before the proof is approved and production is planned.

Related packaging guidance

• Postal boxes — Compare box formats listed for postal and shipping use.
• Packaging size guide — Follow a practical checklist for product and pack-out measurements.
• Kraft packaging boxes — Review a related board-focused packaging category.

Mailer Boxes products

• Custom Mailer Boxes — Plan custom mailer boxes around the item going in the parcel, how it is packed and the artwork you want customers to see.
• Flat Pack Boxes — Flat Pack Boxes planned around the assembled size, product and dispatch route. Send dimensions, closure, quantities and artwork for a specification-led quote.
• Archive Boxes — Archive boxes planned around document size, file arrangement, labelling and where the packed boxes will be stored.

Request a packaging quote with your dimensions, quantity and artwork details.