Only 31 Per Cent of Sack Kraft Still Becomes a Sack

There are 7.4 million tonnes of sack kraft paper made every year, and 2.294 million tonnes of it becomes an industrial sack. The other 69 per cent goes somewhere else entirely. The grade’s name now describes its history rather than its customers, and that single fact reorganises how the whole paper-sack chain should be read.

Thirty-one per cent is not a rounding error — it is a substantial business, and it is the business this research covers. But a substrate whose majority output serves carrier bags, wrapping paper, e-commerce void fill, food service and laminating bases is a substrate whose capacity decisions are made by somebody else’s demand curve. The sack converter is a minority customer of the mill it depends on.

The numbers, and the gap between them

The market runs USD 7,620 million in 2025 to USD 9,880 million in 2033 at 3.30 per cent. Volume grows 1.45 per cent — 7.4 million tonnes, roughly flat in real terms. Value outruns volume by 1.85 percentage points, which is not a demand story. It is a price-and-mix story: a tonne of kraft is worth more each year while the number of tonnes barely moves.

Set that against the sack the tonne eventually becomes. The industrial paper sack market grows 4.68 per cent in value on 1.42 per cent volume — a 3.26 point gap, nearly double the substrate’s. That is the shape of the whole chain in two numbers. Conversion adds more value per year than the sheet does. The mill is selling a commodity with a growth rate close to GDP; the converter is selling a specification object.

Which raises the question a mill has to answer and a converter has to live with: if the sack is where the value growth is, why does the mill not integrate into it, and if the mill is a minority supplier to its own grade, why does the converter not secure its sheet?

The tonne is contested, and the competitor is not another sack

Consider what a tonne of extensible kraft can become. It can be 2,000 twenty-five kilogram cement sacks, sold into a market where the packaging line is 4.19 per cent of the value of the cement inside it and where every buyer is trying to make that percentage smaller. Or it can be retail carrier bags, e-commerce mailers, wrapping and void fill, sold into markets with no such anchor and no such procurement discipline.

The second set of customers has historically been willing to pay more per tonne of paper. That is the mechanism behind the 31 per cent, and it is a mechanism with a direction of travel: as industrial sack demand tracks a cement customer whose output has peaked, the share of the grade going into industrial conversion can only be defended by outbidding somebody. Down-gauging is how the converter does that — taking grammes out of every sack so that a smaller tonnage of kraft produces the same number of sacks. Volume at 1.45 per cent against a sack count that is not falling is not restraint by the mill. It is the arithmetic of a customer base that has learned to use less per unit.

Why the namesake market stopped being the growth market

Three shifts did it, and none of them reverses.

The customer changed shape. Cement and building materials are the largest single end use for industrial paper sacks, and in Europe they account for a majority of deliveries while shrinking. A substrate tied to that end use inherits its trajectory. Sack kraft’s name is a fossil of a period when the two were the same market.

The retail side grew faster. Carrier bags, wrapping paper and e-commerce packaging have their own regulatory and consumer cycles, and they competed for the same machine capacity at prices a cement sack could not match. When a 100 gramme-per-square-metre retail application and a 90 gramme industrial sack come off the same paper machine, the mill optimises for the former when the latter’s buyer is negotiating hundredths of a cent.

Substitution took the bottom of the range. Bulk handling has already removed three-quarters of the sack tonnage it could take, and silo delivery continues to erode the highest-volume, lowest-value end of the cement bag market. What remains for paper is the part where the bag is a specification: valve-filled, barrier-coated, print-critical, and increasingly audited for fibre origin.

The consequence for anyone buying or making sacks

The strategic risk in this substrate is not price. It is priority. A converter buying extensible kraft from a mill whose output is 31 per cent industrial is buying from a supplier for whom that business is a minority interest — and in a tight paper market, allocation follows margin, not contract age. The European paper industry’s own capacity data shows how little slack exists at the top of the quality range.

That is why the fibre-origin question, covered in the companion piece on Europe’s export exposure and the deforestation file, lands on the mill rather than the brand owner. The mill holds the supply relationship with the pulpwood. It will also hold the compliance file. A converter who has not asked where that file comes from is exposed to a document they do not control.

Where this substrate actually ends up is counted at the other end of the cluster. The Global Cement Packaging Market is the hub of this seven-report group: 28.9 billion bags a year, a packaging bill worth 4.19 per cent of the cement tonne they carry, and the format competition that decides how much kraft any of it needs.

About the method

This analysis draws on the end-use derivations, substrate tables and price series in the Global Sack Kraft Paper Market Report, 2026–2033, weighted approximately 70 per cent secondary and 30 per cent primary research. The secondary layer is Cepi capacity and production statistics, Eurosac sector reporting, trade series and mill disclosures. The primary layer is structured interviews and open-ended conversations with kraft mill technical sales and commercial directors, sack converters and paper merchants, together with conference-floor discussion of order books. The 2.294 million tonne industrial volume is a calculation from the substrate total and the industrial share, not a published figure. No third-party market-research estimate is used anywhere in this piece.

Further reading

• Global Sack Kraft Paper Market Report, 2026–2033 — full substrate analysis, end-use split and regional trade.
• Global Industrial Paper Sacks Market, 2026–2033 — the 31 per cent, seen from the converter’s side.
• The Customer That Takes 57 Per Cent of Europe’s Paper Sacks Is Walking Away — what happens to a substrate when its largest end use peaks.
• Extensible Kraft and Down-Gauging — the mechanism that reduces tonnage per unit.