Prices Are Going Up Again: Containerboard Is Up $100 Per Ton in 2026—and the Next Increase Could Be Just as Big

North American containerboard prices have already moved sharply higher in 2026. Fastmarkets RISI has recognized a net $100-per-ton increase through the first two rounds of producer price hikes. For businesses that rely on corrugated packaging, that is a market signal worth watching—not a reason to panic-buy, but a reason to plan.

Containerboard is the paper material used to make corrugated boxes and mailers. When its price rises, it can eventually affect what businesses pay for the corrugated packaging used to ship ecommerce orders, retail replenishment, and wholesale inventory. The timing and size of any impact can vary by supplier, geography, freight, contract terms, box style, and order volume. Still, companies that wait until stock is low may have fewer purchasing options if costs or lead times tighten.

Here is what has happened, what is expected next, and how to make more disciplined packaging decisions.

A volatile year for containerboard pricing

The 2026 price story has not been a straight line. According to Packaging Dive’s June report on Fastmarkets RISI data, the index moved as follows:

That sequence leaves the index up $100 per ton year to date. The most recent August update reports that pricing was flat for a second consecutive month, but it also notes that a third round of announced producer increases is scheduled to begin in September. In other words, the $100-per-ton gain is current index history; it is not a prediction. Any additional market recognition remains uncertain.

Why box buyers are watching closely

Several forces are shaping the market. Producers have cited tighter supply, higher input costs—including old corrugated containers (OCC)—and improved demand conditions. The June report also points to 2025 capacity shutdown announcements totaling nearly 10% of North American production capacity.

At the same time, the picture is not one-dimensional. Pricing index movements do not automatically become identical box-price changes for every buyer. As Packaging Dive reported, the index represents the open market while much of the market moves through contracts; freight, local supplier capacity, board grade, plant economics, and the specific box being purchased all matter. Some industry observers have also described demand as softer than expected, even as supply remains constrained.

That is why the right takeaway is not “every corrugated box will immediately cost more.” The practical takeaway is simpler: review the packaging you buy most often, understand your inventory position, and avoid making rushed decisions after a price or availability change reaches your supply chain.

What the next round could mean

Packaging Corporation of America announced a $140-per-ton containerboard increase intended to take effect September 1. Other producers subsequently announced increases generally ranging from $80 to $110 per ton, with some variation by material, according to Packaging Dive’s July coverage. Those are announced increases—not the same thing as a fully recognized index increase or a universal surcharge on finished boxes.

For packaging buyers, the near-term implications may include:

• supplier conversations about upcoming pricing or contract terms;
• more attention to forecast accuracy and inventory coverage;
• a need to reduce waste from oversized boxes; and
• greater value in standardizing a small set of effective box and mailer sizes.

The businesses best positioned for market swings are usually not the ones buying the most packaging. They are the ones that know which SKUs are critical, which products can use a lighter format safely, and where packaging is being wasted.

Five smart moves for ecommerce and shipping teams

1. Audit the packaging you use most

Start with the 10–20 packaging SKUs that account for most shipments. Record the size, order frequency, current on-hand quantity, supplier lead time, and the products each package serves. That tells you where a supply interruption or cost change would matter most.

For many operations, white corrugated boxes are a core shipping format because they offer rigid protection and a clean presentation. Review whether each box size is still appropriate for the packed product. The goal is a close fit that protects the item without paying to ship empty space.

2. Standardize before you stock up

Buying a year’s worth of every size is not automatically a smart response to a rising market. Excess inventory consumes space, ties up cash, and can leave you with the wrong mix when your product assortment changes.

Instead, standardize where it makes operational sense. A focused set of white corrugated mailer boxes can make picking, packing, and purchasing easier. For orders that need a more polished exterior and firm protection, white corrugated shipping boxes can be a strong default. Match the box to the actual packed dimensions, then use the same tested formats consistently.

3. Use mailers when a box is more protection than the product needs

Not every shipment needs corrugated-board rigidity. Choosing a smaller, appropriate mailer for light or compact merchandise can reduce material use, storage requirements, and packing time.

Bubble Mailers are useful for small items that need light impact protection without the setup of a box. They combine a lightweight outer mailer with internal cushioning, making them a practical option for many accessories, cosmetics, small electronics accessories, and retail goods. Choose the mailer by usable interior dimensions, not only its outside measurement, and do not use a padded mailer as the sole protection for a fragile or crush-sensitive item.

For internal protection inside a carton or for separating small components, Bubble Pouches—also called bubble out bags—can help cushion products and prevent surface contact. They work best as part of a complete pack-out: use them to protect the item, then choose an outer package that prevents excessive movement.

4. Protect the product, not empty space

The cheapest package on paper can be expensive if it leads to damage, replacement shipments, and negative reviews. Conversely, the largest box is not automatically the safest choice. Build simple packing rules for your highest-volume products:

• use a close-fitting box or mailer;
• immobilize the item with appropriate fill when a box has unavoidable void space;
• protect corners and edges for breakable or presentation-sensitive products;
• seal package openings completely; and
• place the shipping label on a clean, flat panel.

Run a small test before changing a pack-out. Pack the item exactly as a team member would, gently shake it, inspect the corners, and compare the material cost, packing time, and dimensional footprint. A data-backed change is more valuable than an across-the-board downgrade in protection.

5. Talk to suppliers early and monitor—not guess

Ask your packaging supplier what is changing in the products you actually buy: pricing effective dates, availability, minimum quantities, lead times, and alternatives if a particular style is constrained. If you buy under a contract, review how the agreement treats indexes, material changes, and freight.

Monitor the market monthly, but do not treat one index as a price list. The fact that containerboard is up $100 per ton does not determine the delivered price of your next order by itself. It is one useful planning input alongside product mix, shipment volume, specifications, and supplier terms.

A practical purchasing checklist

Before your next packaging order, answer these questions:

1. Which five packaging SKUs would disrupt fulfillment if they ran low?
2. How many weeks of supply do we have at normal demand?
3. Are our current box sizes creating unnecessary void space or dimensional cost?
4. Which items could safely shift from a box to a properly sized protective mailer?
5. Which items need a box because breakage, crushing, or presentation risk is too high?
6. Have we confirmed current lead times and upcoming price-effective dates with our supplier?

The bottom line

Containerboard prices are already $100 per ton higher on the Fastmarkets RISI index in 2026, after a volatile first half. The market was flat in July and August, yet producers’ announced September increases make the rest of the year worth watching.

The most effective response is not speculation. It is disciplined packaging management: maintain sensible coverage for critical supplies, standardize proven white corrugated boxes, use Bubble Mailers and bubble pouches where they fit the product, and continually eliminate wasted space without compromising protection. That approach helps control packaging costs in an uncertain market while keeping customer orders secure.

Frequently asked questions

Are containerboard prices up in 2026?

Yes. Fastmarkets RISI has recognized a net $100-per-ton increase in North American containerboard prices in 2026 through the first two rounds of producer hikes. Prices were flat in July and August, according to the latest August reporting.

Will corrugated box prices rise by the same amount?

Not necessarily. Containerboard is an input to corrugated boxes, but finished-box pricing also depends on contracts, freight, location, board grade, supplier capacity, box specifications, and order volume.

Should I buy more boxes now?

Review your critical SKUs and lead times first. Buying enough inventory to support normal operations can be prudent, but excess inventory can create storage and cash-flow problems. Standardizing the right sizes and reducing wasted space are often better first steps.

When should I use bubble mailers instead of corrugated boxes?

Use a bubble mailer for compact, non-fragile items that need light cushioning. Use corrugated boxes for heavier, fragile, crush-sensitive, or multi-item orders that need more rigid protection.