How to Customize the Outer Film and Inner Liner of an Insulated Mailer

Custom Options for Thermal Insulated Mailers

Yes. The outer film and inner liner of this thermal insulated mailer can be specified to suit the product, shipment conditions, cold-chain requirements, and order volume. Standard production uses white PE film on the outside and closed-cell sponge foam on the inside. Customers can also request changes to the film gauge, outer colour, foam density, bag dimensions, printed design, and adhesive band location.

Structure and Available Configurations

The mailer is manufactured as a flat, gusset-free pouch with three welded edges. A permanent adhesive strip, covered by a release liner, provides closure, while the double-fold flap helps complete the specified sealing structure. This format is designed for efficient packing and can be placed inside a courier satchel without requiring an additional box.

Outer Film Selection

The standard exterior is white PE film. Depending on the project, the film gauge can be selected according to the required strength and construction. Available colour choices include white, cool white, and black. The appropriate film specification should be assessed alongside the product weight, shipping method, and required protection.

Inner Foam Liner

The internal layer consists of closed-cell sponge foam. Its density is a configurable feature, allowing the liner to be matched to the thermal protection and handling needs of different shipments. This construction is suitable for products that need additional insulation during refrigerated or cold-chain transport.

Sizes, Printing, and Closure Details

Common sizes include 20 × 28 cm, 25 × 33 cm, 30 × 39 cm, and 35 × 45 cm. Custom dimensions are also available. Front-panel branding can be produced by flexographic printing in one or two colours. Customers may additionally specify the position of the adhesive band to align with their packing process and closure requirements.

Applications in Cold-Chain Shipping

These insulated mailers are intended for medicine, food, perishables, and other temperature-sensitive products. When used with an ice pack, they can support pharmacy shipments and 2-8°C cold-chain applications. The product and its temperature-monitoring documentation can remain together inside the same shipping package, helping simplify fulfilment and traceability.

Specification Overview

Manufacturing and Quality Support

Huizhou Ecopack Packaging Products Co., Ltd. manages structural development, printing, lamination, bag conversion, and inspection internally. Its R&D team supports tooling and structural design, and a 3D structural drawing is provided for approval before printing plates are produced. The company operates a factory covering more than 10,000 square metres, with daily capacity exceeding 500,000 pouches across rotogravure and flexographic production lines.

Quality procedures follow ISO 9001:2015 requirements. Incoming materials, production stages, and finished orders are inspected, with AQL sampling applied before shipment. The company also maintains FSC Chain of Custody certification. A US distributor currently uses Ecopack insulated mailers for cold shipments at an annual volume of approximately 10 million pieces.

Frequently Asked Questions

Can I change the outer material of the insulated mailer?

The standard outer material is PE film. You can select the film gauge and request a white, cool white, or black exterior. Any alternative structure should be reviewed according to the intended application and technical requirements.

Is the foam liner density adjustable?

Yes. The standard liner is closed-cell sponge foam, and its density can be customized to suit the required insulation and packaging performance.

What details are required for a quotation?

Please provide the desired dimensions, film structure, print colours, estimated order quantity, and preferred customization. Samples generally require 3 to 5 working days, while mass production usually takes 15 to 25 days after artwork approval.

Conclusion

The outer and inner components of the thermal insulated mailer can both be tailored. Available choices include PE film gauge and colour, closed-cell foam density, pouch size, front-panel printing, and adhesive band position. This flexibility allows the mailer to be configured for medicine, food, pharmacy, and other cold-chain shipments using an ice pack. For technical consultation or a quotation, contact manager@ecoppack.com.

About Ecopack

Huizhou Ecopack Packaging Products Co., Ltd. is a flexible packaging manufacturer based in Guangdong, China. Established in 2011, the company produces custom composite pouches and bags for insulated mailers, thermal packaging, coffee, pet food, spout, kraft, compostable, and ESD applications. Its in-house R&D and structural design process includes 3D approval drawings before printing plates are made. Production and inspection are handled at its more than 10,000-square-metre facility under ISO 9001:2015 quality procedures. Ecopack also holds FSC Chain of Custody certification and serves customers across multiple industries.