Every day, millions of cardboard boxes arrive at warehouses, doorsteps, and shop floors across the UK. They’re opened, emptied. But what happens next? The answer matters more than most people realise.

Cardboard is the single most common packaging material in Britain, and how we handle it at the end of its first use has real consequences for our climate, our natural resources, and our bottom lines.

Here we break down exactly what happens to cardboard after it’s been used and explain why the order in which we tackle those options makes all the difference.

The Scale of the Problem: UK Cardboard Waste in Numbers

The UK generates around 12.5 million tonnes of paper and cardboard annually. Cardboard alone accounts for over 20% of all commercial waste produced in Britain. In 2024, paper and cardboard packaging waste equated to around 4,709,000 tonnes, according to government statistics (GOV.UK), making it by far the largest packaging material category.

The good news? Paper and cardboard now holds the highest recycling rate of any packaging material in the UK, at 86.4% (Defra, 2024).

The less good news? Even at that impressive rate, a significant volume ends up in landfill or incineration. Or it is recycled, while better than landfill, is still not the most sustainable option available.

Step by Step: What Happens When Cardboard Is Recycled

When a used cardboard box gets put in a recycling skip or baler, it begins a long and resource-intensive journey. Understanding this process is essential for any business that wants to make genuinely informed decisions about its packaging waste.

Stage 1: Collection and Baling

Used cardboard is collected from businesses and households and transported to a Materials Recovery Facility (MRF). For businesses generating high volumes, cardboard is typically baled on-site to reduce collection costs. The bales, often weighing around 25 tonnes per load, are then transported to paper mills.

Stage 2: Sorting

At the facility, cardboard is sorted into grades. Corrugated cardboard (the type used in shipping boxes which consists of three layers including a fluted middle) is separated from boxboard (thinner single-layer material used in cereal boxes). This distinction matters because different grades are used to make different end products and command different values on the recycled materials market.

Stage 3: Pulping

The sorted cardboard is shredded and mixed with warm water and chemicals to break down the paper fibres. This creates a wet slurry known as pulp. Residual contaminants such as staples, plastic tape, adhesive labels, are removed at this stage using screening and cleaning techniques.

Stage 4: Filtering and De-inking

The pulp is filtered and cleaned further. If the recycled material is destined for lighter-coloured paper products, a de-inking process using chemicals including hydrogen peroxide and sodium hydroxide removes residual inks and dyes. This step uses significant volumes of water.

Stage 5: Drying, Pressing and Rolling

The cleaned pulp is sprayed onto a screened conveyor where water drains away. The remaining material is pressed, dried using heated rollers, and wound onto large rolls. These rolls of recycled paper are the raw material for new cardboard manufacturing.

Stage 6: Manufacturing New Cardboard

The recycled paper rolls are fed through an industrial corrugator, which sandwiches a fluted inner sheet between two flat outer liners to recreate corrugated board. This is then cut and formed into new boxes. Importantly, recycled cardboard fibres are almost always blended with some virgin (new) wood pulp at this stage, because fibre quality degrades slightly with each cycle. Paper fibres can be recycled approximately five to seven times before becoming too short to be useful.

Why Recycling Alone Is Not Enough

Recycling is clearly better than sending cardboard to landfill or incineration. But the process described above is neither simple nor cheap, and it has a meaningful environmental cost of its own.

The recycling process requires vast amounts of water, energy, and chemicals. It also involves multiple vehicle movements: from the waste producer to a baler, then to a paper mill, then to a board manufacturer, then to a box maker. And at the end of all that, you have… a cardboard box. Essentially what you started with.

When cardboard ends up in landfill instead of being recycled, the environmental damage is even greater. Cardboard decomposing anaerobically in landfill produces methane, a greenhouse gas more than 20 times more potent than carbon dioxide. This seeps into the atmosphere and contributes to climate change.

The waste hierarchy, reduce, reuse, recycle, exists for a reason. Recycling sits third on that list. Reuse comes second. And for good reason.

The Better Path: Reusing Cardboard Boxes

Reusing a cardboard box before it enters the recycling stream is the most efficient and most sustainable option available. It skips the entire energy-intensive pulping, cleaning, drying, and reforming process. All because the box doesn’t need to be broken down and rebuilt. It simply gets used again.

At Reuseabox, this is exactly what we do. We work with businesses across the UK to divert high-quality once-used boxes out of the recycling stream and put them back to work. Every box reused is a box that doesn’t need to be manufactured from scratch. And this can save trees, carbon water, energy, and money.

Reuse vs. Recycle: The Key Differences

Not all used cardboard is suitable for reuse. Boxes that are wet, heavily contaminated, or structurally compromised cannot be safely reused for shipping. In these cases, recycling remains the responsible next step. At Reuseabox, any boxes that pass through our sorting process and fail inspection are directed to local recycling rather than landfill, ensuring materials remain in the circular economy.

Similarly, cardboard that has become contaminated with food, grease, or liquids, such as pizza boxes, cannot be recycled through standard streams. This material may be composted, sent to energy recovery, or in some cases landfilled. This is why contamination prevention matters so much: handling cardboard carefully after its first use keeps more options open.

When Cardboard Finally Reaches the End of Its Life

Even after multiple reuse cycles, cardboard fibres eventually degrade too far to be repulped effectively. At this point, composting is often the final destination. Around 3 million tonnes of cardboard are composted in the UK each year. Under the right conditions, cardboard biodegrades within approximately two months, returning organic matter to the soil rather than contributing to landfill methane emissions.

The Business Case for Cardboard Reuse

For businesses, the argument for reuse isn’t just environmental, it’s also financial.

• Save up to 50% on packaging costs by sourcing once used boxes from Reuseabox instead of buying new
• Earn revenue from surplus boxes rather than paying for baling and collection
• Demonstrate genuine circular economy credentials to customers and stakeholders
• Receive a free Reuse Impact Report with every Reuseabox order, quantifying your savings in trees, CO₂, water and energy

How Reuseabox Works: Our Circular Model

Our model is simple, but its impact is significant:

1. Businesses with surplus once-used boxes register with Reuseabox and sell them to us.
2. We collect, sort, and inspect each box for structural integrity.
3. Reusable boxes are redistributed to businesses that need affordable, sustainable packaging.
4. Boxes not suitable for reuse are recycled locally. Nothing goes to waste.
5. Every transaction comes with a free environmental impact report, so you can see exactly what your reuse choice has saved.

This is a true circular economy in action, keeping materials in use at the highest possible level before allowing them to cascade down to recycling and, eventually, composting.

What Should Your Business Do?

If your business generates used cardboard boxes or buys cardboard boxes, here is how to think about your options in order of environmental preference:

• Reuse: Segregate good-quality used boxes and sell or redistribute them through a scheme like Reuseabox. This keeps material at its highest value in the supply chain.
• Source reused: Buy once used boxes from Reuseabox rather than purchasing new. You’ll save money and reduce demand for virgin manufacturing.
• Recycle responsibly: For boxes that cannot be reused, ensure clean, dry cardboard goes to a reliable recycler. Avoid contamination with food or moisture.
• Avoid landfill: Never skip the above steps and send recyclable or reusable cardboard to general waste.

Conclusion: Recycling Is Good. Reuse Is Better.

The recycling process for cardboard is impressive and far better than landfill. But it is energy-intensive, water-heavy, and requires multiple vehicle movements and industrial processes to produce what we already had: a box.

Reuse skips all that. Faster, cheaper, lower-carbon, and keeping fibres in circulation for longer before they degrade. For businesses looking to genuinely reduce their environmental footprint, cardboard reuse is the clearest, most practical step available today.

At Reuseabox, we’ve built a business around this simple truth. Last year alone, millions of boxes were reused through our community, keeping real, measurable volumes of material out of the recycling stream and away from landfill entirely.

The waste hierarchy starts with reduce. But when packaging is already in circulation, reuse is the next best thing. And it’s easier than you think.

Frequently Asked Questions

What happens to cardboard after it’s recycled?

Used cardboard is collected, baled, and transported to a paper mill where it is shredded, mixed with water to create pulp, cleaned, dried, and pressed into rolls of recycled paper. These rolls are then used to manufacture new corrugated cardboard boxes. The process typically blends recycled fibre with some virgin wood pulp to maintain material strength.

How many times can cardboard be recycled?

Cardboard fibres can typically be recycled five to seven times before they degrade too far to be useful. Each time cardboard is pulped, the fibres shorten. Once they become too short, virgin pulp must be added to compensate, which is why reusing boxes before recycling them is always the more sustainable option.

Is it better to reuse or recycle cardboard boxes?

Reusing is significantly better for the environment than recycling. Reuse skips the energy-intensive pulping, cleaning, drying and re-manufacturing process, reducing carbon emissions, water use, and demand for virgin materials. Recycling remains the right option for cardboard that cannot be reused because of contamination or damage.

Can businesses sell their used cardboard boxes?

Yes. Reuseabox works with UK businesses to buy once used cardboard boxes that would otherwise be baled and recycled. Businesses receive a financial return for their surplus or used stock, and the boxes are redistributed to other companies that need affordable, sustainable packaging.

What cardboard cannot be recycled?

Cardboard contaminated with food grease (such as pizza boxes), moisture, wax or plastic coatings, or heavily soiled material generally cannot be processed in standard recycling streams.