If you have never ordered bespoke packaging before, the jump from 'I need a box for this product' to a finished, branded package can feel opaque. It does not need to be. Here is how a custom box is actually designed, from your first measurements to a print-ready dieline our prepress team signs off before anything is made.
Start with the product, not the box
Good packaging design begins with what goes inside. Measure your product at its widest, longest and tallest points, and decide how much protection it needs in transit. A fragile item wants a snug fit with room for void fill; a stackable retail item wants a clean, shelf-ready face.
Think about how the box will be used too. Is it posted, so it needs to survive a courier network? Is it opened in front of a customer, where the unboxing moment matters? These answers shape the box style long before any artwork.
Choosing a box style
Most packaging maps to a handful of proven structures. A regular slotted carton (the classic shipping box) is strong and economical for posting and storage. A tuck-end carton suits retail and lighter food items, with a clean printable face. A rigid or magnetic-close box reads as premium for gifting and luxury lines.
Picking the right style up front keeps cost down and recyclability high, because each style uses board efficiently and folds from a single flat sheet wherever possible.
What a dieline actually is
A dieline is the flat, unfolded template of your box. It shows every cut line (the outer shape and any slots) and every crease line (where the board folds), drawn to exact dimensions for your chosen board thickness.
It is the single source of truth that ties design and manufacturing together. Your artwork is positioned on top of the dieline so that print, folds and panels line up perfectly once the box is assembled. Get the dieline right and everything downstream follows.
Why board thickness changes the maths
A box is not just its internal dimensions. The board itself has thickness, so a dieline adds small allowances at folds and panels to make sure the finished box holds your product without bulging or crushing. Slot widths, glue tabs and flap sizes all flex with the material.
This is why a dieline is generated parametrically from your length, width, height and board choice, rather than drawn by hand each time. It keeps the geometry accurate across sizes and materials.
Adding artwork and branding
Once the structure is set, branding goes on: logo, colours, ingredients or regulatory text, and any sustainability marks. Artwork should extend slightly past each cut edge (the bleed) so there are no white slivers after cutting, and important text should sit a few millimetres inside the edges (the safety margin) so it is never trimmed.
Water-based inks and minimal lamination keep a printed box recyclable, which matters for both your customers and UK packaging rules.
Proof, prepress and production
Before anything is manufactured, the dieline and artwork are produced as a proof and checked by our prepress team. This catches the practical issues that are easy to miss on screen: fold clearances, registration, colour expectations and trim safety.
A dieline is a proof for review and approval, not an unattended print-to-plate file. Only once it is approved does it move to production. It is also sensible to confirm fit against a physical sample for your first run, since board behaviour varies slightly by machine and material.
Doing it yourself, faster
You do not have to start from a blank page. Our configurator lets you enter your dimensions and material and see a box take shape, then send it to us as a quote. We turn that into a print-ready dieline and guide you through artwork.
Whether you arrive with a precise spec or just a product and a deadline, the path is the same: measure, choose a style, confirm the dieline, approve the proof, and we make it.