24 x 24 x 4 Flat Kraft Boxes

Single or Double Wall Corrugated

Most flat boxes in this size use single wall corrugated board in kraft brown. It is stiff enough to stop a framed print bending, light enough to keep courier costs reasonable and takes simple one or two colour printing well.

For glass, mirrors and heavy signs, double wall board is the safer choice. The extra flute layer resists punctures from forklift tines and the corners of other parcels. It also stops the large flat faces from bowing when boxes are stacked several high in a van.

Kraft outer liners are the default because they hide scuffs and suit most brands. A white outer liner is available if you want brighter print or a cleaner look for retail delivery.

Board grade also affects how the box handles humidity. Galleries storing packed work in a basement or unheated unit should lean towards the heavier option, because damp air softens lighter board over time and weakens the corners exactly where protection matters most.

Protecting Corners and Glass

Damage on flat items almost always starts at a corner. A box dropped on its edge transfers the whole impact into one point of the frame. Cardboard corner protectors slip over each corner of the frame and hold it a few millimetres off the box wall, which absorbs that shock.

For mirrors and glazed frames, add a sheet of corrugated pad or foam across the face so that pressure on the lid is spread rather than focused on the glass. We can supply corner pieces, edge protectors and cut pads sized to your items, so packing is consistent no matter who does it.

If you ship several sizes of frame, ask about adjustable corner pieces that fit a range of frame depths, which reduces the number of parts you have to stock. Separate cardboard edge protectors for framed pieces can be supplied with the boxes so the whole pack arrives together.

Printing on 24 x 24 x 4 Flat Kraft Boxes

A large flat lid gives plenty of space for branding. Many galleries print a single logo in the centre of the lid in black or a brand colour, leaving the rest plain kraft. Sign makers often add handling marks such as 'this way up' and 'fragile glass' in large type so couriers treat the box carefully.

Printing inside the lid creates a reveal when the box is opened, which customers notice when they have just bought a piece of art. A short care note, hanging instructions or a thank-you message works well there. Flexographic printing keeps costs down on plain kraft, while digital printing handles full colour artwork for short runs.

Keep the shipping label area clear on the lid design. Couriers apply labels wherever there is space, so leaving a plain panel near one corner stops their label covering your logo, and it makes the box look tidier when it arrives. Heavier two-colour or full-coverage print is possible on request; the printed box options page shows what each process looks like on kraft.

Who Orders This Size

Art galleries and independent artists ship framed and canvas work in these boxes. Picture framers use them for customer collections and deliveries. Mirror and homeware brands use them for round and square wall mirrors. Sign makers and print shops ship acrylic and foam board signs. Record shops and collectors use them for framed album displays.

Photographers selling large prints also use them, often with a stiff card folder inside, because the flat format keeps prints perfectly flat with no risk of rolling or creasing.

Furniture and interiors businesses use the size for tabletop samples, decorative wall panels and upholstered headboard swatches. Anything that must stay flat, square and free of creases benefits from a box that matches its footprint rather than a larger carton filled with loose padding. Very large or valuable mirrors sometimes move up to double wall corrugated cartons for extra stiffness.

Measure the Frame, Not the Picture

The one measurement that catches people out with a 24 x 24 x 4 box is the frame depth. A print may be 610 mm square, but a box frame with a deep rebate can be 50 mm or more from the glass to the back of the hanger, and a corner protector adds another 10 mm at each side. Measure the finished, framed piece including hangers and D-rings, then add the protector thickness, and compare that with the 102 mm internal depth. If you are close to the limit, the 150 mm deep variant is the safer choice.

Once you have that number, email it over with a rough quantity and a custom quote comes back the next working day. A free proof shows the print position before cutting, production runs 4 to 7 working days from your approval, and tracked UK mainland delivery is free and takes 2 to 3 working days. Low minimums are set per job, and crushed or misprinted cartons reported within 10 days are reprinted or refunded. For orders mixing several frame sizes, pairing this box with smaller flat cardboard boxes keeps the range consistent.