A convenience-store chicken tray has a deceptively difficult job.

Keep the food hot.

Stop grease reaching the shopper’s hands.

Prevent excessive moisture loss.

Maintain enough structural stiffness to survive a heated display.

Let customers see what they are buying.

And ideally, avoid trapping so much moisture that the eating experience deteriorates before the customer reaches the checkout.

That is the engineering problem behind a new custom fiber-based tray developed by ProAmpac for Circle K’s Flamin’ Hot Boneless Chicken Wings, a product created with PepsiCo/Frito-Lay.

ProAmpac announced its role on September 10, two months after Circle K introduced the Flamin’ Hot wings nationally in the United States. Circle K described the July launch as its first nationwide hot-food collaboration with a major consumer brand.

The packaging supplier says Circle K wanted to improve several aspects of the existing hot-food presentation, including:

heat retention;

moisture retention;

grease resistance;

hot-hold time;

and product visibility.

ProAmpac subsequently engineered a tray specifically around the recipe and portion size, while adapting PepsiCo’s original branding concept for production.

That sounds like a relatively small foodservice-packaging project.

It actually illustrates one of the harder areas of fiber substitution.

Cold dry food gives paper a relatively forgiving environment. Hot greasy food does not.

Fiber Has to Survive the Product, Not Just Hold It

A paper or paperboard structure performs very differently when it encounters hot chicken.

Heat changes material behavior.

Moisture can reduce board stiffness.

Fat and oil can penetrate untreated fiber.

Steam can create condensation.

And the package may remain inside a heated cabinet while customers repeatedly open and close the display around it.

This means the fiber itself cannot do the entire job unaided unless the structure has been engineered appropriately.

Grease resistance may come from:

coatings;

barrier treatments;

liners;

laminations;

or combinations of those technologies.

Visibility introduces another potential component if a transparent window is used.

And the package still has to remain practical for operators to load quickly during foodservice production.

This is why the phrase “fiber-based tray” tells us surprisingly little about the complete packaging architecture.

It tells us what the dominant structural substrate is.

It does not tell us everything attached to it.

That Distinction Is Missing From the Announcement

ProAmpac describes the Circle K solution as fiber-based.

It does not disclose publicly:

the paperboard grade;

basis weight;

fiber source;

recycled content;

grease-barrier chemistry;

whether the structure contains a polymer liner;

the material used for product visibility;

whether components are separable;

or whether the finished tray has been tested for recyclability.

That does not mean the packaging contains any particular undisclosed material.

It means we do not know.

And that is an important distinction for a sustainability-focused packaging publication.

Fiber-based does not automatically mean plastic-free.

It also does not automatically mean recyclable in a household paper stream.

ProAmpac’s wider foodservice portfolio demonstrates why the distinction matters.

One of its existing hot-food trays is described as paperboard with a leak-proof film lining and anti-mist window. The company says the paperboard portion is recyclable once the film is removed.

Elsewhere, ProAmpac’s RAPTray platform combines lightweight paperboard with a high-barrier film laminate and offers EasyPeel technology on certain configurations to help separate film from board for recycling.

Those are other products, not evidence of the exact construction used for Circle K.

But they illustrate a broader point:

high-performing fiber food packaging is often an engineered material system rather than simply a folded piece of paperboard.

The Sustainability Claim Should Therefore Wait

Interestingly, ProAmpac’s announcement does not make a specific recycling claim for the Circle K tray.

That restraint is appropriate.

The release concentrates on food quality, presentation and operational performance rather than saying the package is recyclable, compostable or plastic-free.

I would maintain that discipline.

There is currently no published evidence establishing:

a percentage plastic reduction;

a carbon-footprint reduction;

recyclability certification;

compostability;

a conventional-plastic package that was eliminated;

or a life-cycle comparison with the previous Circle K format.

So this should not become another headline saying:

“Circle K replaces plastic with sustainable fiber packaging.”

The available evidence does not support that conclusion.

What has actually been demonstrated is more specific:

Circle K and ProAmpac redesigned a hot-food tray around the performance requirements of one product.

That is already a useful packaging story.

Hot-Hold Packaging Has a Moisture Paradox

The most interesting technical challenge in the release is moisture.

ProAmpac says the tray was engineered to keep the chicken hot and moist longer.

That sounds straightforward.

For fried and breaded food, it is not.

Lose too much moisture and the interior can become dry.

Retain too much water vapor around the surface and condensation or moisture migration can damage texture.

Food scientists have long recognized crispness as an important sensory characteristic in breaded fried foods, particularly where a low-moisture outer layer surrounds a high-moisture interior.

Packaging therefore has to manage opposing objectives.

You want to slow undesirable moisture loss from the food.

But you may also need to control the humid microenvironment inside the package.

That is why some hot-food packs use combinations of:

venting;

anti-fog features;

window geometry;

specific closure designs;

and barrier properties.

ProAmpac has not disclosed exactly how the Circle K tray manages that balance.

Nor has it published comparative moisture or texture measurements.

So we should not claim the new pack objectively keeps the coating crisp for a specified period.

But the problem itself is important.

Hot-food packaging is not simply about trapping as much heat and moisture as possible. It is about managing both.

Visibility Makes the Problem Harder

Circle K also wanted customers to get a clearer view of the food.

That is commercially understandable.

Hot cabinets are impulse-selling environments.

The package is not simply transportation.

It is part of the merchandising system.

A shopper can see:

portion size;

appearance;

product condition;

and potentially whether the food still looks freshly prepared.

ProAmpac says improved visibility was one of the design objectives and that the finished package supports a more premium shelf presentation.

But visibility introduces another packaging compromise.

An opaque paperboard tray is easy to print and provides excellent branding space.

A transparent viewing area may require another material or structural opening.

If a separate transparent component is added, designers then have to consider:

heat resistance;

fogging;

grease;

adhesion;

food contact;

and eventual separation or recycling.

Again, we do not know the exact Circle K construction.

The more useful lesson is that shelf appeal can add complexity back into a package even while designers are trying to simplify its material structure.

Flamin’ Hot Branding Adds Another Requirement

This package also has an unusually strong visual identity to carry.

Flamin’ Hot is not a generic chicken program.

The packaging has to communicate a well-established Frito-Lay brand while still functioning as Circle K foodservice packaging.

ProAmpac says it began with PepsiCo’s original brand design and then optimized the package for manufacturing.

That phrase—optimized for production—is worth attention.

Brand designers can create striking graphics and structural concepts.

The converter then has to make them commercially repeatable.

That means translating the concept into:

printable surfaces;

die-cutting geometry;

forming tolerances;

adhesive or locking systems;

food-contact requirements;

and production speeds.

A package that looks excellent in a design rendering but takes too long to erect in thousands of convenience stores is not a successful package.

This is where structural packaging engineering becomes operational engineering.

Convenience Stores Add Labor to the Packaging Equation

Foodservice packaging is unusually sensitive to labor.

At a manufacturing plant, a packaging line may operate with dedicated automated equipment.

Inside a convenience store, the person preparing food may also be:

serving customers;

stocking shelves;

cleaning equipment;

monitoring the hot cabinet;

and operating the register.

Every extra packaging step matters.

A tray that takes five seconds longer to load may sound insignificant.

Multiply that across hundreds of stores and thousands of servings and it becomes an operating cost.

That means Circle K’s packaging requirements likely extend beyond food quality.

The package needs to fit the realities of retail foodservice.

It should be:

quick to load;

consistent;

easy to identify;

stable in the hot cabinet;

easy for consumers to handle;

and unlikely to create grease or cleanup problems.

ProAmpac says the design was intended to improve operational performance, but the company has not published quantitative labor or packing-time data.

That is another KPI worth asking for.

Hot Holding Is Also a Food-Safety Environment

Hot packaging cannot be evaluated solely against consumer experience.

Temperature control matters for food safety.

The latest full FDA Food Code remains the 2022 edition, supplemented in 2024. It serves as the federal model used by state and local retail-food regulators.

For time/temperature control for safety foods, the model code generally uses 57°C/135°F as the minimum hot-holding temperature, subject to the detailed provisions and the rules adopted by individual jurisdictions.

The package itself is not what establishes regulatory compliance; the foodservice operation controls the cooking and hot-holding system.

But the container still has to function inside that environment.

It should not deform excessively.

The viewing feature should tolerate the heat.

Grease resistance should remain effective.

And the structure must continue protecting customers who pick up hot food.

This gives the packaging another requirement beyond preserving quality:

it has to remain mechanically reliable at the temperature at which the food is being merchandised.

ProAmpac Has Already Been Pushing Hot-Hold Fiber Further

The Circle K project also sits inside a broader development strategy.

ProAmpac has been expanding its hot-food-to-go packaging portfolio.

Its existing Hot Food Tray is marketed for use in heated cabinets and is reported by ProAmpac to have been validated for hot holding for four hours at 194°F.

The company also markets HotRap and RAPTray solutions for hot-food applications and says some formats can support hot holding for up to four hours.

And just one week before the Circle K announcement, ProAmpac said it would showcase new fiber-based Hot Hold Box, Hot HandRap and Hot Hold Carton formats at LUNCH! 2026 in London, again citing hot-hold periods of up to four hours for those solutions.

That gives the Circle K project wider context.

It is not an isolated custom carton.

ProAmpac appears to be building a broader platform around fiber-dominant packaging capable of operating in the heated food-to-go environment.

That is a technically more demanding market than dry snack cartons or standard takeaway bags.

But We Do Not Know Circle K’s Actual Hold-Time Improvement

This is where the announcement becomes frustrating.

ProAmpac repeatedly says the package:

extends hot-hold time;

keeps the chicken hot and moist longer;

and improves food quality.

Longer than what?

The previous tray?

An open serving container?

Another material?

How many minutes?

At what cabinet temperature?

With what starting food temperature?

What moisture loss?

What sensory score?

None of those numbers are disclosed.

That makes the performance claim impossible to benchmark.

This is not unusual in commercial packaging announcements.

But it limits what the industry can learn from the project.

For a restaurant or convenience-store operator, the difference between:

20 minutes;

45 minutes;

and two hours

could fundamentally change food waste, batch size and labor planning.

A quantified hot-hold improvement would therefore be much more commercially meaningful than the phrase “keeps food hot longer.”

Longer Hold Time Could Be a Bigger Sustainability Story Than Fiber

This is an overlooked point.

Suppose improved packaging allows a retailer to hold chicken longer without falling below its quality specification.

The store may be able to:

cook fewer emergency replacement batches;

discard less unsold food;

reduce markdowns;

and maintain availability with less overproduction.

Those effects could matter environmentally and economically.

But they should not be assumed.

ProAmpac has not published data showing that Circle K has reduced food waste because of the new tray.

Still, it demonstrates why sustainable-packaging analysis should not focus exclusively on packaging material.

A slightly more complex package that materially reduces food waste can potentially outperform a simpler package that allows more product to be discarded.

To evaluate that, we need real operational data.

How many wings were discarded before?

How many now?

Did average hold time change?

Did sales change because visibility improved?

Did complaints about temperature or texture decline?

That would turn this packaging story into a genuine system-performance case study.

Grease Resistance Is Another Area Where “Paper” Becomes Complicated

Grease is particularly difficult for fiber packaging.

Untreated cellulose readily interacts with liquids, and oil penetration can create:

visible staining;

loss of mechanical properties;

messy handling;

and an unattractive retail appearance.

Barrier chemistry is therefore important.

Historically, grease-resistant food packaging has used several approaches, including polymer extrusion coatings and various chemical treatments.

The industry is now under pressure to deliver oil resistance while also meeting changing requirements around recyclability and substances such as PFAS.

ProAmpac says the Circle K tray offers enhanced grease resistance, but does not disclose the chemistry used.

There is no basis for saying the coating contains—or does not contain—any specific chemistry.

There is also no published information showing how the barrier affects paper recycling.

Those are reasonable questions for future disclosure.

Because the environmental performance of fiber food packaging depends heavily on what has been added to make the fiber functional.

“Fiber-Based” Is Becoming a Performance Category, Not a Material Description

This is a broader change in paper packaging.

Consumers often think of paper packaging as one material.

Industrial packaging engineers increasingly deal with functional paper systems.

Paper plus barrier.

Paper plus sealant.

Paper plus window.

Paper plus grease resistance.

Paper plus oxygen barrier.

Paper plus moisture barrier.

Paper plus heat resistance.

The strategic goal is usually to retain enough fiber content and compatibility with paper recycling while providing functionality historically delivered by plastic.

ProAmpac’s current high-barrier RP-2000 paper platform illustrates how far this development has gone. The company markets it as a fiber-based replacement for structures including paper/foil and paper/metallized-PET laminates, with oxygen and moisture barriers designed for sensitive dry foods.

Hot greasy chicken is another performance frontier.

The material challenge is different.

But the direction is the same:

make fiber do jobs it historically needed more plastic to perform.

That Does Not Mean Plastic Disappears Immediately

This point matters.

A rational transition toward fiber-based food packaging may still retain small quantities of functional polymer where they provide disproportionate value.

A thin liner that prevents leaks can potentially enable a substantial reduction in a rigid plastic structure.

A transparent window may improve sell-through and reduce food waste.

A sealant may allow a fiber structure to run at commercially viable speed.

Whether that trade-off is environmentally preferable has to be measured.

The goal should not automatically be:

zero plastic at any cost.

It should be:

the minimum material complexity required to deliver the food safely and efficiently while maintaining a credible end-of-life pathway.

That is a more difficult target.

It is also a more useful one.

Recyclability Data Would Make This Project Much More Interesting

For paper converters and recyclers, the biggest missing information is what happens after use.

Can the Circle K tray enter a paper recycling stream?

Does the consumer need to remove a film or window?

Is the grease barrier dispersible?

Does food residue interfere with recovery?

Has the complete pack undergone a recognized recyclability assessment?

ProAmpac does have other fiber-based packaging systems with explicit recycling instructions and, in some cases, separable film constructions.

No equivalent information appears in the Circle K announcement.

So I would not attach a recyclability conclusion to this launch.

That may sound conservative.

It is necessary.

Fiber content is a design attribute. Recyclability is a system-performance claim.

The two should not be confused.

The Specific Food Matters More Than Packaging Suppliers Sometimes Admit

Another valuable aspect of this project is that ProAmpac says the tray was designed specifically around the recipe and portion size.

That is significant.

Different hot foods create different packaging environments.

French fries release moisture differently from chicken.

Breaded wings behave differently from a rotisserie chicken.

Pizza has different grease distribution.

Sauced food introduces another leak challenge.

Portion size changes internal air volume and thermal mass.

Even seasoning can influence surface oil and moisture behavior.

That is why one universal “sustainable hot-food carton” is unlikely to optimize every application.

The more sophisticated approach is what ProAmpac describes here:

design the package around the food.

That may mean more SKUs for the packaging supplier.

But it can also mean better performance and less unnecessary material.

This Is Product-Packaging Co-Development

The sequence is worth noting.

PepsiCo supplied the brand concept.

Circle K supplied the retail and foodservice requirements.

ProAmpac translated those requirements into packaging.

That is effectively product-packaging co-development.

Instead of developing the food first and asking a packaging supplier to put it into an existing container, the pack becomes part of the product-launch process.

This approach is increasingly important in prepared food.

The consumer does not experience:

chicken;

then package.

They experience the chicken after the package has held it for some period of time.

If the package causes the food to dry out, become soggy, leak grease or look unattractive, it has changed the product.

That means packaging is effectively part of the recipe’s delivery system.

Convenience-Store Food Raises the Stakes

Circle K is also not packaging food for a traditional restaurant environment.

Convenience stores have been expanding prepared-food programs partly because foodservice can offer attractive margins and give customers another reason to visit.

Circle K’s July launch of the Flamin’ Hot wings was positioned as its first national hot-food collaboration with a major brand, with the product initially exclusive to Circle K before wider retail availability planned for September.

For the retailer, the tray therefore performs several commercial functions simultaneously.

It protects food.

It acts as a billboard for Flamin’ Hot.

It differentiates the hot cabinet.

It supports impulse purchase.

And it affects how long the product remains sellable.

This makes packaging much closer to retail equipment than disposable containment.

A few cents of added packaging cost could be justified if the package materially improves sell-through or reduces food waste.

Again, those economics have not been disclosed.

But that is the right framework for evaluating the design.

The Best KPI May Not Be Package Cost

Imagine two trays.

Tray A costs less.

But chicken quality drops after 25 minutes.

Tray B costs slightly more.

But the product remains within Circle K’s sensory specification substantially longer.

Which tray is cheaper?

You cannot answer without knowing:

food cost;

waste rate;

average holding time;

sales probability;

labor;

and package cost.

This is why packaging procurement based solely on unit price can be misleading.

For hot prepared food, the useful KPI may be:

packaging cost per saleable serving.

If better packaging extends the window in which the food can be sold at acceptable quality, a more expensive package could lower the total cost per item sold.

ProAmpac’s announcement hints at that value proposition.

It does not yet provide the numbers needed to prove it.

Product Visibility Could Also Affect Waste

The same logic applies to transparency.

If customers can see the food and are more willing to buy it, visibility could increase sell-through.

That could reduce unsold inventory.

But a clear window can add material complexity.

That produces a classic packaging trade-off:

better merchandising versus simpler material construction.

The correct answer depends on whether the merchandising feature delivers enough value to justify its material and end-of-life implications.

This is the kind of calculation that sustainable packaging increasingly needs.

A packaging feature should not be judged simply because it adds material.

It should be judged by what function that material performs.

What I Would Ask ProAmpac Next

The announcement gives enough information to establish the engineering challenge.

It does not provide enough to benchmark the solution.

The most useful follow-up data would be:

the total tray weight;

fiber percentage;

plastic or other non-fiber percentage;

barrier and window structure;

recycled-fiber content;

recyclability test results;

food-contact certification;

maximum validated hot-hold duration;

cabinet temperature during testing;

temperature loss over time;

moisture-loss comparison;

grease-resistance test method;

packaging time per serving;

and the food-waste rate before and after the change.

Those figures would tell us whether the packaging is simply visually interesting or genuinely changes Circle K’s foodservice economics.

This Is Why Hot Food Is a Serious Test for Fiber Packaging

It is relatively easy to make paper packaging look sustainable around a dry product.

Hot food exposes every weakness.

Heat attacks structure.

Steam challenges dimensional stability.

Fat demands a barrier.

Condensation affects presentation.

Consumers need to handle the package safely.

The retailer needs speed.

The food needs to remain appealing.

And recyclers eventually have to deal with whatever coatings, liners and contamination remain.

That is why this Circle K project deserves attention.

Not because it proves fiber has replaced plastic.

It does not.

Not because ProAmpac has demonstrated a recyclable hot-food package.

That has not been disclosed either.

It matters because it shows the performance threshold fiber packaging has to cross if it wants to expand deeper into prepared food.

The Next Fiber-Packaging Race Will Be About Function per Gram

Packaging suppliers have spent years competing on material substitution.

The next competition may be more demanding.

How much performance can be extracted from the smallest amount of packaging?

How little barrier chemistry is required to stop grease?

How much non-fiber material is necessary for visibility?

How long can food remain saleable?

How much board is required to retain structural strength under heat and moisture?

And how easily can everything be recovered after the customer is finished?

That is a better way to judge functional fiber packaging.

Circle K wanted a tray that kept spicy chicken hot, moist, visible and clean enough to merchandise in a heated cabinet.

ProAmpac says it delivered that package.

Now the industry needs the numbers.

Because the real breakthrough in fiber-based hot-food packaging will not be proving that paperboard can hold chicken.

It will be proving that a fiber-dominant structure can manage heat, steam and grease for the required holding period, run efficiently in foodservice operations, use less problematic material—and still have a credible recycling route when the food is gone.

For paper and foodservice-packaging producers, that leaves the most useful question:

How much functional chemistry and non-fiber material does a paper tray really need before “fiber-based” stops being the most meaningful way to describe the package?

Last Updated on 11/09/2026 by Jota Machinery