Thermal box liners

Fitted paper-based, PET, and bubble wrap insulation for shipping cartons · Insulation for your box to perform.

CentiPack thermal liners turn standard corrugated boxes into insulated shippers for temperature-sensitive products. Choose from paper, PET, and bubble wrap options to match your product, packing process, and shipping requirements. Pair your liner with the right gel packs for a complete pack-out built around your target temperature and transit time.

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Three white CentiPack cartons side by side on a cream ground, each opened to show a different thermal liner — kraft paper, a white liner under clear film, and silver metallised bubble.

Which liner is right for you?

  • A kraft paper liner fitted inside an open white CentiPack carton, its top panel folded back.

    Paper

    The sustainable choice, for brands whose customers care about recyclability.

  • A white liner under clear film fitted inside an open white CentiPack carton, its top panel folded back.

    PET

    The moisture-resistant choice, for consistent performance with gel packs.

  • A silver metallised bubble liner fitted inside an open white CentiPack carton, its top panel folded back.

    Bubble Wrap

    The protective choice, for maximum cushioning, a clean surface, and radiant heat reflection.

How it works

  1. Line

    Place the liner inside the carton, covering the base and sides.

  2. Pack

    Add your product, inner packaging, and refrigerants according to your pack-out.

  3. Seal

    Fold the liner's top panels closed, then seal the carton and apply your shipping labels.

A kraft paper liner printed all over with the CentiPack logo, fitted inside an open white carton marked RUSH, PERISHABLE and INSULATED, with the liner's top panel folded back.

Why choose CentiPack thermal liners

  • Material optionsChoose paper, PET, or bubble wrap insulation to suit your product, packing process, and sustainability goals.
  • Thermal insulationDesigned to keep shipments cold for 24–48 hours when paired with the right refrigerant pack-out.
  • Protective cushioningInsulating materials cushion your product and inner packaging during handling and transit.
  • Easy, consistent pack-outA defined interior cavity makes packing simple and repeatable across your team.

Tailored pack-outs

Thermal protection built around your shipment

The right pack-out depends on your product, its target temperature, and how long it's in transit. We work with you to select the liner material, thickness, carton size and refrigerant configuration to help achieve your desired shipping duration and temperature range.

Actual thermal performance depends on the complete pack-out, including payload, refrigerant conditioning, and external shipping conditions.

Talk to a packaging specialist
An open white CentiPack carton with a kraft paper liner fitted inside and its top panel folded back, two gel packs lying in front of it.

Brand your box

Every shipment becomes your billboard

Customize the outer carton to showcase your brand. Full-color, custom printed box comes paired with the liner of your choice.

Want us to quote your custom program? Please fill out this form or contact us to discuss your optimal solution.

Request a custom quote
An open blue carton printed with the CentiPack logo, a kraft paper liner fitted inside with its top panel folded back, and two gel packs with a small navy product box alongside.

Applications

  1. Pharmacy fulfillment

    Box liners for shipping temperature-sensitive prescriptions directly to patients.

  2. Healthcare products

    Custom pack-outs for products with specific temperature and transit requirements.

  3. Testing kits & specimens

    Tailored shipping solutions for testing kits, medical samples, and specimens.

Frequently asked questions

What is a thermal liner?

A thermal liner fits inside a corrugated shipping carton to slow heat transfer. Paired with refrigerants, it creates an insulated pack-out for temperature-sensitive products.

What's the difference between paper, PET, and bubble wrap liners?

Each material has its own strengths. Paper liners offer a familiar, paper-based format. PET liners resist moisture, so they keep performing when gel packs create condensation. Bubble wrap liners provide the most cushioning, and their metallic exterior helps reflect heat.

Which liner should I choose?

It depends on your product, target temperature, transit time, and packing process. Share your requirements and we'll help you compare options.

Can I use a liner with my existing shipping box?

In many cases, yes. The liner needs to fit your carton and leave room for the complete pack-out. Share your box's interior dimensions and payload, and we'll confirm the fit.

Do I need gel packs?

For cold shipments, yes. Refrigerants are typically part of the pack-out. The type, quantity, placement, and conditioning depend on your product and shipping requirements.

How long will a thermal liner keep my shipment cold?

With the right pack-out, our liners are designed to keep shipments cold for 24–48 hours. Actual performance depends on the liner, refrigerants, payload, and conditions in transit. Contact us to discuss your temperature range and transit time.

Are the liners recyclable?

Ask us for disposal guidance and about the recyclability of our liner options.

Can you help develop a custom pack-out?

Yes. We'll work with you to select the liner material, carton size, insulation configuration, and refrigerants that fit your product and shipping needs.

How can I request samples and pricing?

Click Request Samples & Pricing and choose Paper, PET, Bubble Wrap, or Help Me Choose. Include your shipping requirements and estimated volume so we can recommend the right options.

Thermal integrity. Validated performance. Manufacturing scale

Mass volume through our manufacturing partners — Quoted to your quantity and specifications. Low pricing guaranteed

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