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Article/Bag-in-Box Containers: A Sustainable Solution for Efficient Liquid Packaging

Bag-in-Box (BIB) is an innovative packaging solution designed for storing and transporting liquids safely and efficiently.
Known for its convenience and eco-friendliness, Bag-in-Box systems are increasingly adopted across diverse industries — from food and beverages to industrial chemicals.

In this article, we explain the structure, advantages, environmental impact, and applications of Bag-in-Box containers, as well as introduce SEKISUI SEIKEI’s “Rontainer”, our proprietary BIB solution trusted by global manufacturers.

"Foldable Bag-in-Box (BIB) liquid container by SEKISUI SEIKEI, showing compact storage design"
"Rontainer Bag-in-Box packaging with outer box for liquid transport and protection"

What Is a Bag-in-Box (BIB)?

A Bag-in-Box consists of two main components:

  • Inner bag (Bag) – A flexible liner made from polyethylene (PE) or multi-layer film that securely holds the liquid.
  • Outer box (Box) – A rigid outer shell made from cardboard or plastic that protects the bag during transport and handling.

This dual-layer structure combines high liquid retention and excellent transport durability, making Bag-in-Box an ideal choice for liquids that require clean, leak-free packaging.

Advantages of Bag-in-Box Packaging

One of the biggest advantages of Bag-in-Box containers is their ease of handling and storage efficiency.
Unlike rigid containers, BIBs can be folded flat before filling and after use, which significantly reduces storage space requirements and waste volume.

The sturdy outer box allows safe transport without spillage, while the lightweight structure minimizes transportation costs and improves operational efficiency from filling to disposal.

Environmental Benefits

Bag-in-Box packaging contributes to sustainability in multiple ways:

  • Lightweight and compact design reduces fuel consumption during transportation.
  • Lower CO₂ emissions compared with traditional rigid containers.
  • Reduced waste volume after disposal thanks to its collapsible structure.

As a result, BIBs are recognized as a highly eco-friendly packaging solution that aligns with global efforts toward carbon neutrality and resource efficiency.

Applications of Bag-in-Box Containers

Bag-in-Box systems are used in a wide range of industries, including:

  • Food and beverage: Seasonings, syrups, oils, and dairy products.
  • Industrial and chemical: High-purity chemicals, industrial reagents, and corrosive or viscous liquids.
  • Emergency and outdoor use: Water storage for camping or disaster relief.

Their versatility and cleanliness make them suitable for both consumer and industrial liquid logistics.

SEKISUI SEIKEI’s “Rontainer” – Reliable Bag-in-Box Solution

At SEKISUI SEIKEI CO., LTD., we manufacture and sell Bag-in-Box containers under the brand name “Rontainer.”
Since its launch, Rontainer has been used across diverse industries including industrial chemicals, food, purified water, dairy, and pharmaceuticals.

Each Rontainer is produced using blow molding technology, which provides a strong, self-standing structure.
Additionally, every unit undergoes a 100% automatic leak inspection to ensure the highest quality and reliability for our customers.

"Automatic leak inspection line for Bag-in-Box containers ensuring zero leakage"

SEKISUI SEIKEI’s “Rontainer” – Reliable Bag-in-Box Solution
Learn more about Rontainer (Bag-in-Box, BIB)

Discover the Future of Sustainable Packaging

Bag-in-Box systems represent the future of sustainable liquid packaging — balancing functionality, safety, and environmental performance.
At SEKISUI SEIKEI, we continue to develop high-quality BIB solutions to meet the growing global demand for efficient, eco-friendly containers.