Custom Triangle Boxes in Prism and Wedge Shapes

How Triangle Boxes Are Built

A prism box is made from a single folded sheet with three long sides and triangular ends. The ends can tuck in, lock with a tab, or be closed with a separate triangular lid. For confectionery, a tear strip along one edge makes opening easy and adds a satisfying moment when the customer unwraps the box.

Wedge boxes have a triangular base, three walls and a lid that may be hinged or separate. Sandwich wedges usually have a window on the long side to show the filling, and they are often sealed with a sticker or a tamper-evident label.

Both styles fold flat for storage and assemble quickly. Larger or heavier prisms may use a thin corrugated board, while most food and gift triangles use folding boxboard.

Getting the Proportions Right

For a prism, measure the length of the product and the width of its base, then decide on the triangle's height. An equilateral triangle, where all three sides are the same, looks classic and balanced. A taller, narrower triangle looks more elegant and takes less shelf width, while a flatter, wider one stands more steadily.

For a wedge, measure the two short sides and the long side of the product, plus its height. Sandwich wedges are usually based on the bread size, and cheese and cake wedges on the slice angle. Allow a small margin so the product slides in without squashing.

We send a flat dieline with your quote, and it is worth folding a paper version and testing it with the real product before you approve the proof.

Shelf space is worth a thought as well. Prisms can lie on one face or stand on their end, and wedges can be stacked point to base in alternating rows to fill a rectangular shelf or shipping carton without wasted gaps. If you know how retailers will display your product, we can size the triangle so a set number fits neatly across their shelf or into a standard outer case. The same shelf-planning applies to cube boxes sold in rows, which these wedges often sit beside.

Food Contact and Practical Details

Triangle boxes that hold food directly, such as sandwiches, cheese and cake, should be made from board suitable for food contact. Food-contact grade board is available on request, and we note it on your quote. Grease-resistant board helps with buttery pastries and oily fillings.

Windows for sandwich wedges are usually covered in a clear film that keeps the food visible and protected. Labels with ingredients, allergens and use-by dates can be printed on the box or added at packing.

For chilled products, ask about board with a coating that resists condensation, so the box stays firm in a refrigerated display.

Sandwich makers supplying several shops often print one generic wedge and apply a filling label at packing, which keeps the menu flexible and the box order simple.

Printing on Three Sides

A triangle box presents two or three faces at once, depending on how it sits on the shelf. Prism boxes usually show two sloping sides at the front, so place your logo and product name on the face that will be seen most and repeat key information on the other. Wedges show their long side and top, so the brand often goes on the lid.

Bold designs that wrap around the corners make the shape feel deliberate. Stripes, geometric patterns and illustrations that continue across faces look especially striking on a triangle.

Finishes such as matt lamination, foil and embossing add a premium touch, particularly on chocolate and gift prisms.

Remember that one face of a prism will often be hidden underneath. Use that bottom panel for barcodes, ingredients and legal text, freeing the two visible faces for the design customers actually see on the shelf. Upload the artwork through the free proof request and we will map it to the three faces.

Fold a Paper Prism Before You Approve Anything

Triangle boxes are the one shape where a paper mock-up is worth more than any drawing, so ask for the dieline with the quote, print it, fold it and put the real product inside. A bar that sits short or a sandwich that will not clear the window shows up in a minute. Start by saying prism or wedge, then give the product length and base width for a prism, or the three sides and height for a wedge, and tell us if food touches the board.

Say how retailers will display the box, since prisms and wedges are sized differently to fill a shelf. A custom quote comes back by email within one working day with the dieline attached, with simpler styles from £0.25 and low minimums quoted per job. The free proof follows once the size is agreed. Production takes 4–7 working days after approval and the flat boxes arrive by free tracked delivery to UK mainland addresses in 2–3 working days. Misprinted or damaged boxes reported within 10 days are reprinted or refunded. Brands that want a four-sided twist on the same idea often look at trapezoid boxes with sloping sides as well.