SBS vs kraft vs corrugated for high-volume packaging

How to choose the right packaging material covers the decision for a single box. This guide takes the same three board families and looks at them the way a buyer purchasing at volume has to: as a material bought on every square inch of every unit.

The three families

SBS: when color accuracy is the requirement

SBS — solid bleached sulphate — is the default for printed retail packaging. The bleached white surface gives ink a neutral base, so a specified Pantone prints as intended and photographic images hold detail.

At volume the variable to control is caliper, quoted in points, where one point is one thousandth of an inch. Every extra point is bought on every square inch of every carton. Specify the lightest caliper that carries the product's weight, survives handling and stacks if it needs to.

Kraft: when the look is the reason

Kraft is unbleached, so it keeps the natural brown of the pulp. Brands choose it because it reads as undyed and unfussy — which is a legitimate and deliberate aesthetic, not a cheaper option. Kraft is not automatically less expensive than SBS; cost depends on grade, caliper and market conditions, so treat any difference as something to confirm on your own quote.

The real consideration is print. Ink on a brown base is not ink on a white base: colors darken and shift, whites cannot be printed as white without an opaque underlay, and photographic reproduction is limited. Design for it rather than against it — one or two colors, confident shapes, type that works in a single ink.

Corrugated: when it has to survive the journey

Corrugated is structural. The flutes act as arches, which is what gives it crush resistance and cushioning at relatively low weight. It is the material for anything that ships on its own: mailers, shipping cases, heavier goods.

Specify it by flute grade and liner. For printed mailers the practical choice is usually between E-flute and B-flute — see E-flute vs B-flute. Where high-quality print is essential on corrugated, litho lamination bonds an offset-printed sheet to the board.

And greyboard, which is a different thing entirely

Greyboard is dense recycled board used as the structural core of a rigid box. It is never printed directly — a printed wrap is laminated over it. It belongs in this conversation only to be excluded from it: greyboard is not an alternative to SBS or kraft, it is the substrate of a different construction.

Specifying board at volume

1. State what the box must do: the product weight, how it is handled, whether it stacks, and whether it ships alone or inside an outer.
2. Let the supplier propose a board and caliper against that, rather than specifying a caliper you have inherited from a previous job.
3. Ask whether a lighter caliper with a structural change — an auto-lock bottom, a board insert — would do the same job.
4. Confirm it on a physical sample, filled with the real product. Board is a tactile decision.
5. Ask the same question of every supplier so the quotes are comparable — see how to compare packaging quotes.

Sustainability, honestly

All three are paper-based and all three are, in principle, recyclable through paper streams. What actually happens depends on local facilities and on what has been applied to the board — some laminates and coatings complicate recycling, and a window film is a different material entirely.

If a specific environmental characteristic matters to your brand or your customers, ask your supplier for documentation on the exact grade being supplied rather than relying on a general statement about the material family. It is a reasonable thing to ask for, and a specification you can stand behind is worth more than a claim you cannot evidence.

The short version

SBS for accurate print on retail packaging, kraft for a natural look you design around, corrugated for anything that ships alone. At volume the discipline is specifying the lightest board that genuinely does the job, and confirming it on a filled sample rather than a description.

Send the product weight and how it ships and ask for a board recommendation rather than specifying one you inherited.