Earth Cardboard Launches New Box Complying with Click Post Changes Effective October 2026

Earth Cardboard's New Box for Click Post Standard

In anticipation of the Click Post regulation changes announced by Japan Post, Earth Cardboard Co., Ltd. has launched a new cardboard box designed to meet the new maximum size requirements effective from October 1, 2026. This initiative aims to assist e-commerce businesses and individual sellers who utilize flea market apps in adjusting to the new standards without disruptions to their shipping operations.

Launch of the New Box Product

Starting July 9, 2026, Earth Cardboard began selling the new product titled "A4 3cm Thickness Brown Standard Cardboard Box (Click Post New Standard Max)." This box is specifically engineered to comply with the revised dimensions introduced by Japan Post, ensuring that users can continue to enjoy efficient and cost-effective shipping solutions.

Key Features of the New Box

This cardboard box has been meticulously designed to closely adhere to the new maximum size specifications. The external dimensions are adjusted to 338mm x 232mm x 28mm, which allows for easy insertion into standard mailboxes. With this upgrade, the box can accommodate items up to 2 kg, compared to the previous maximum weight limit of 1 kg, which opens up more possibilities for users.

In addition to Click Post, this box is suitable for various mailing and shipping services like Yu-Pack and Standard Mail, making it a versatile option for both individual customers and businesses.

Changes to Click Post Regulations

To give a clear overview, here are the comparisons of the Click Post regulations before and after the changes:

Criteria	Before September 30, 2026	After October 1, 2026
----	-------	----------
Price	185 JPY	240 JPY
Length	14cm to 34cm	14cm to 34cm
Width	9cm to 25cm	Minimum 9cm that can be placed in mailboxes
Thickness	Up to 3cm	Thickness suitable for mailboxes
Total Size	No specification	Within 60cm total
Weight	Up to 1kg	Up to 2kg
Submission	Mailbox or Post Office	Mailbox only

Quality and Innovation

Founded 73 years ago, Earth Cardboard Co., Ltd. specializes in the design, manufacturing, and sales of cardboard packaging products. The company operates production facilities in Saitama and Fukuoka, providing an extensive range of over 4,000 products. In recent years, Earth Cardboard has received recognition for its advanced technology and commitment to sustainability, striving to meet the needs of customers focused on SDGs (Sustainable Development Goals).

Earth Cardboard emphasizes customer feedback, continuously working to contribute to the success of their clients' businesses through their innovative packaging solutions. Their new product lines reflect a deep understanding of the evolving e-commerce landscape and the demands of packaging materials.

Customization Options Available

For those considering printing on cardboard boxes, Earth Cardboard also offers full-color printing services, tailored to meet a variety of packaging needs.

For inquiries or more information, visit Earth Cardboard's official website at bestcarton.com or contact their product planning manager, Daisuke Okuda, via email at [email protected].