Leak-proof and recyclable cartons in Japan transport liquids safely


Managed by office retail company KOKUYO, “THINK OF THINGS” Shop & Café in Tokyo now offers highly functional cardboard boxes that are leak-proof enough to hold liquid inside called CARTON 2.0.

CARTON 2.0 is a joint project of “THINK OF THINGS” of KOKUYO and IZAK, a company that prioritizes the development of cardboard boxes based on functionality. It is a medium-sized archive box for ordinary households, and is made of cooling and waterproof materials particularly used for transporting fishing and refrigerated goods. Although it is a cardboard box, it can protect its contents from moisture and has cooling effects. It also has an upgraded waterproof function that is safe enough to retain water inside.

This makes it perfect for storing and protecting important files, clothes, and even food for its cooling effect. You can also use them as a laundry bin or even a flower box. The possible uses of these boxes go beyond what one thinks with the usual cardboard boxes.

Cardboard boxes invented to replace polystyrene containers

CARTON 2.0 uses IZAK’s “Cool Dan” PET aluminized polyester film for the lining on the cardboard. The characteristics of this film and the layers of air on the cardboard surfaces add cooling, water and humidity sealing effects to this box. This material is also environmentally friendly. It is non-toxic and does not produce dioxins when heated.


The structural design is also very unique. No glue is used for the product. Instead, a carton folds tightly into a box with no space in between, so it can hold liquid inside.

However, please note that there may be possible pinholes on the surface and gradually become permeable. This is not a permanently waterproofed product.

Carton 2.0 Archive boxes are available at THINK OF THINGS stores in Japan.

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